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Các câu hỏi tương tự
b1 : chọn đáp án đúng
15, Ill come and see you before i ....... for the States
A, leave B, will leave C, have left D,shall leave
16, The little girl asked what ........... to het friend
A, has happened B, happened C,had happened D, would have been happened
18, he said he ....... return later
A ,will B, would C,can D,would be
19 , jack.......... the door
A, has just opened B, open C,have opened D, op...
Đọc tiếp
b1 : chọn đáp án đúng
15, I'll come and see you before i ....... for the States
A, leave B, will leave C, have left D,shall leave
16, The little girl asked what ........... to het friend
A, has happened B, happened C,had happened D, would have been happened
18, he said he ....... return later
A ,will B, would C,can D,would be
19 , jack.......... the door
A, has just opened B, open C,have opened D, opening
21, almost everyone ...... for home by the time we arrived
A, leave B,left C, leaves D, had left
22, By the age of 25, he ........... two famous novels
A,wrote B, writes C,has written D,had written
23, when her husband was in the army , Mary ......... to him twice a week
A, was reading B,wrote C,was written D,had written
24, i couldn't cut the grass because the lawn mower .......... a few days previously
A, broken down B, has been broken C,had broken down D,breaks down
25, i have never played badminton before.This is the first time i ......... to play
A,try B,tried C,have tried D,am trying
26, Since ...... ,i have heard nothing fron him
A,he had left B,he left C,he has left D, he was left
28, By the end of next year , Georege ...... english for two years
A, will have learned B,will learn C,has learned D, would learn
21. Since 2003 they ______ their son every year.
a. visited b. have visited c. visit d. will visit
22. Usually, Mr. Pile ______ us Physics but today he ______ill, so Mrs. Young ______ us
a. teaches/ is/ is teaching b. has taught/ is / teaches
c. is teaching/ has been/ teaches d. taught/ was/ was teaching
23. I am sorry I cant hear what you ______ because everybody ______ so loudly.
a. are sayi...
Đọc tiếp
21. Since 2003 they ______ their son every year. a. visited b. have visited c. visit d. will visit 22. Usually, Mr. Pile ______ us Physics but today he ______ill, so Mrs. Young ______ us a. teaches/ is/ is teaching b. has taught/ is / teaches c. is teaching/ has been/ teaches d. taught/ was/ was teaching 23. I am sorry I can't hear what you ______ because everybody ______ so loudly. a. are saying/ will talk b. was saying/ has talked c. have just said/ is talking d. said/ was talking 24. I ______ the same car for more than ten years. I ______ about buying a new one. a. have had/ am thinking b. will have/ think c. had/ will think d. am going to have/ was thinking 25. My best friend and I ______ each other for over fifteen years. We still ______ together once a week. a. were knowing/ got b. knew/ have got c. have known/ get d. had known/ are getting 26. The secretary ______ on the report for more than three hours. She hopes she may finish it by the lunch time. a. is working b. will be working c. has been working d. had been working 27. Please turn off the stove. The water ______ for more than fifteen minutes. a. is boiling b. was boiling c. has been boiling d. will be boiling 28. In the 19th century, it ______ two or three months to cross North America by covered wagon. The trip _____ very rough and often dangerous.. a. took/was b. had taken/ had been c. took/ had been d. had taken/ was 29. My grandfather ______ a very exciting life. When he was young, he ______ on the farm in the country, where there ______ a lot of cattle and meadows. a. has/ has lived/ have been b. had/ lived/ were c. was having/ had lived/ had been d. has had/ is living/ are 30. Mary _____ on the essay for two hours now and she _____ that she _____ it in one more hour. a. is working/ has hoped/ can finish b. has been working/ hopes/ will finish c. will have worked/ hopes/ finishes d. had been working/ hoped/ would finish 31. I ______ there once a long time ago and ______ back since. a. went/ have not been b. have gone/ will not be c. was going/ am not d. had gone/ was not 32. Those drivers ______ for three hours when a heavy storm suddenly ______ a. were driving / broke b. drove/ was breaking c. had driven/ was breaking d. had been driving/ broke 33. I ______ to visit you yesterday, but you ______ at home. a. have come/ are not b. had come/ were not c. came/ were not d. was coming/ have not been 34. What ______ when the accident ______ ? a. have you been doing/ occurs b. are you doing/ will occur c. will you be doing/ has occurred d. were you doing/ occurred 35. We ______ TV when it ______ to rain a. are watching/ will start b. have watched/ will be starting c. had watched/ was starting d. were watching/ started 36. I ______ a mystery movie on TV when the electricity ______. a. will be watching / is going b. watched/ was going c. was watching/ went d. have watching/ goes 37. While the doctor ______ Mr. Jones, his son ______ outside this morning a. was examining/ was waiting b. will be examining/ are waiting c. had been examining/ was waiting d. are examining/ is going to wait 38. When the boss____ into the office, his secretary ____, and the accountant ______ on the phones a. was walking/ has been typing/ has been talking b. had walked/ was typing/ had talked c. walked/ was typing/ was talking d. had been walking/ had typed/ talked 39. The guard ______ to his Ipod, so he ______ the fire alarm. a. had listened/ was not hearing b. was listening/ did not hear c. listened/ had not heard d. was listening/ was not hearing 40. The Titanic ______ the Atlantic when it ______ an iceberg. a. was crossing/ struck b. crossed/ was striking c. had crossed/ was striking d. crossed/had struck 41. We were late because we had some car problems. By the time we ______ to the train station, Susan ______ for us for more than two hours. a. got/ had been waiting b. had got/ were waiting c. had been getting/ waited d. were getting/ waited 42. Mike ______ to sit down because he ______ all day at work a. had been wanting/ was standing b. had wanted/ stood c. wanted/ had been standing d. was wanting/ had stood 43. The motorcycle ______ to George for years before Tina ______ it last week. a. belonged/ had bought b. was belonging/ had bought c. had belonged/ bought d. had been belonging/ bought 44. No matter what ______ next, I ______ you. a. will happen/ support b. happened/ would have supported c. happens/ will support d. is happening/ have supported 45. Wait a minute. I ______ this box for you. a. am carrying b. will carry c. carry d. am going to carry 46. I ______ he ______. a. do not think/ will come b. am not thinking/ will come c. have not thought/ comes d. will not think/ comes 47. At this time tommorrow, Peter ______ for the graduation examination, so now he ______ very nervous although he ______ hard for more than 3 years. a. will sit/ has been feeling/ was learning b. will be sitting/ feels/ has been learning c. sits/ will feel/ is learning d. will have sat/ is feeling/ learns 48. By this time next summer, you ______ your studies and ______ a job a. will be completing/ will find b. had completed/ would find c. have completed/ find d. will have completed/ found 49. By the time I ______ to the office, the meeting ______ without me. My boss ______ furious me and I ______. a. will get/ begins/ is/ am fired b. am getting/ will begin/ is going to be/ will be fired c. got/ had already begun/ was/ was fired d. have got/ began/ has been/ am firing 50. By the time he ______ next month, he ______ for our company for ten years. a. retires/ will have been working b. will retire/ has been working c. has retired/ is working d. would retired/ was working 51. Look! There are a lot of clouds. It ______ soon a. is going to rain b. has been raining c. will be raining d. will have rained 52. I am busy. I think I ______ my driving test this week. a. have not taken b. am not going to take c. will have not taken d. do not take 53. A: I called you last night after dinner, but you were not there. Where ______? B: I ______ overtime at the fitness center. a. has you been/ had worked b. were you/ have worked c. were you/ was working d. you were/ worked 54. For the last hundred years, travelling ______ much easier and very comfortable. Now you ______ from New York to Los Angeles in a matter of hours. a. becomes/ fly b. had become/ flew c. will have become/ will fly d. has become/ can fly 55. John ______ for his girlfriend for two hours but she ______. At last, he ______ to the movie without her. a. has been waiting/ does not come/ has gone b. will wait/ has not come/ will go c. is waiting/ will not come/ is going d. had been waiting/ did not come/ went
Chọn đáp án đúng
1. According to estimates, there ____ no energy shortage after these large dams ____
A. will be - have been constructed B. is - will be constructed
C. should be- had been constructed D. was- would be constructed
2. Can we use the court now? Not yet. But as everything is ready, we can start as soon as they_____
A. finished B. will finish
C. have finished D. will have finished
3. Im sure he ____ you the moment he ____ any news about the case
...
Đọc tiếp
Chọn đáp án đúng
1. According to estimates, there ____ no energy shortage after these large dams ____
A. will be - have been constructed B. is - will be constructed
C. should be- had been constructed D. was- would be constructed
2. " Can we use the court now? " " Not yet. But as everything is ready, we can start as soon as they_____ "
A. finished B. will finish
C. have finished D. will have finished
3. I'm sure he ____ you the moment he ____ any news about the case
A. has called - got B. called - is getting
C. is calling - will get D. will call - gets
4. We_____ for a cottage to rent while we____ our relatives in the USA next summer
A. have looked- were visiting B. have been looking - visited
C. were looking- had visited D. will look - are visiting
5. During the winter months, many people make plans about what they ___ once winter ____
A. are doing - will arrive B. do- will have finished
C. will do- has arrived D. have done- arrives
6. ____ get older, the games they play become increasingly complex
A. Children B. Children, when they
C. As children D. For children to
Help me , pls !
nếu bạn nào tốt bụng thì gạch chân dấu hiệu và viết tắt tên thì giúp mình với ạ ! Mình cảm ơn!
EX 1:
3. The secrtary ___ the report by 10:00 yesterday
a.hasnt finished b.hadnt finished c. didnt finished d. would finish
4. Janes eyes are red. She __
a.cried b. has cried c. has been crying d. had cried
5. This room is dirty. Someone _____ in here
a. smoked b. has smoked c. had been smoking d. has been smoking
6. Arsenal _____ next Monday
a, wins b. will win c.woul...
Đọc tiếp
nếu bạn nào tốt bụng thì gạch chân dấu hiệu và viết tắt tên thì giúp mình với ạ ! Mình cảm ơn!
EX 1:
3. The secrtary ___ the report by 10:00 yesterday
a.hasn't finished b.hadn't finished c. didn't finished d. would finish
4. Jane's eyes are red. She __
a.cried b. has cried c. has been crying d. had cried
5. This room is dirty. Someone _____ in here
a. smoked b. has smoked c. had been smoking d. has been smoking
6. Arsenal _____ next Monday
a, wins b. will win c.would win d. is winning
7. It _____ rain tomorow
a. rains b. will rain c. is going to rain d. is raining
8. I'll come and see you before I _____ for America
a. leave b. will leave c. have left d. shall leave
9. The little girl asked what ____ to her fiend.
a. has happened b.happend c. had happend d. would have been happend
10. John ____ a book when i saw him
a. is reading b. read c. was reading d. reading
11. He said he ___return
a. will b. would c. can d.would be
12. Jack _____ he door
a. has just opened b. open c. will have opened d.opening
13.I have been waiting for you ____
a. since early morning b. since 9a.m c.for two hours d.all the correct
14. My sister __ for you since yessterday
a. is looking b. was looking c. has been looking d. looked
15.Jack )____ the door.
a. has just painted b.paint c. will have paited d. painting
16. The train ____ half an hour ago
a. has been leaving b. left c. has left d. had left
17. we __ Doris since last Sunday
a. don't see b. haven't seen c. didn't see d. hadn't seen
18.when i last saw him, he ___ in London
a. has lived b. is living c. was living d. had been living
19. she is tired now. She ___ for a long time
a. has been learning b.has learned c. learns d.learned
20.they will have gone home before you _____ to meet them
a. came b. come c.will come d. are coming
EX 2:
1. hurry up or the train __ before you catch it
a. will leave b. leaves c. will have left d.has left
2. now my sister ____a bicycle of her own
a. is having b. are having c. has d. had
3.A football team ___ chieflyof 12 players
a. composed b. composes c.comprised d. comprises
4. This is the first time I ___ here
a. am b.have been c.was d.be
5last week , my professor promised that he _____ today
a. would come b. will come c. comes d.coming
6. My girls friend arrived after I ____ for her about half an hour
a,was waiting b.had been waiting c.has been waiting d. have waited
7.did she say the _____ him tomorrow ?
a.has visited b. will visit c. would visit d. iss
8. ________ to rain before you woke up this morning ?
a. did it begin b. has never begun c.had it begun d. would it begun
9.my daughter saw an elephent this morning but she _ one before
a. had never seen b. has never seen c.never seen d. never had seen
10. I ___ in Da Nang before i moved to dong nai
a. have been living b. have lived c. had lived d. had been living
11. there are many ways ____ to Rome
a. is leading b. are leading c. leading d.led
12.when we got home, dinner ____ so we had a drink first
a. was preparing b. was being prepard c. was prepared d. had been prepared
13. she was tired. she ___ for a long time
a. has been learning b. had been learning c. learned d. was learning
14. he __ in space for 10 days by tomorrow
a. will travel b. will be travelling c. is not visiting d. does not visit
15. he said he would visit me, but he ___ me yet
a. has not visited b. had not visited c. is not visiting d. does not visit
16. The weather ___ fine so far this week
a. is b. has been c. was d. had been
17 Before the prime Minister leaves New Your he ___ several talks
a. will have had b. would have c. will be having d. has
18. we had just got out of car when it ___ to set fire
a. has begun b. had begun c. was beginning d. has
19.As soon as he __ a certificate in English, he will apply for a jop
a. would get b.got c. gets d.will get
20.he was told that he _ knocked out in the first round
a. had been b.was c. has been d. was being
Choose the best answer
1. I ___ a lot of time travelling since I ___ this new job.
A. spend/get B.have spent/get C. spent/got D. have spent/got
2. When I ___ at school, we all ___ Latin.
A. was/study B. am/study C. was/studies D. had been/studied
3. After he ___ breakfast, he ___ down to write some letters.
A. has /sat B. has had/sits C. had had/sits D. hat had/sat
4. When we arrived at the stadium last Sunday, the match ___ already ___.
A. had/star...
Đọc tiếp
Choose the best answer
1. I ___ a lot of time travelling since I ___ this new job.
A. spend/get B.have spent/get C. spent/got D. have spent/got
2. When I ___ at school, we all ___ Latin.
A. was/study B. am/study C. was/studies D. had been/studied
3. After he ___ breakfast, he ___ down to write some letters.
A. has /sat B. has had/sits C. had had/sits D. hat had/sat
4. When we arrived at the stadium last Sunday, the match ___ already ___.
A. had/started B. started C. has/started D. had/started
5. They ___ a house by June next year.
A. will built B. are building C. have built D. will have built
6. The film ___ by 2.00 tomorrow.
A. ends B. will end C. is ending D. will have ended
7. Tom ___ to Hanoi before.
A. is never B. was never C. have never been D. has never been
8. When we came to the stadium, the match ___.
A. already begins B. already began C. had already begun D. have already begun
9. This is the first time I ___ such a beautiful girl.
A. ever saw B. had even seen C. have never seen D. ever seen
10. He ___ in this school before he ___ for England.
A. taught/had left B. had taught/left C. taught/has left D. has taught/left
11. Fifty minutes ___ the maximum length of time allotted for the exam .
A. are B. is C were D. be
12. One of my neighbours____ curious about other people's private life.
A. being B. were C. is D. been
13. Seven months ____ a long time for me to wait.
A. being B. were C.are D. is
14. A lot of restaurants ____ open at night.
A.are B.is C.was D.be
6. By the end of next month, we _______ our English course.
a. have completed b. will be completed
c. will have completed d. completed
7. If you had worked harder, you _______.
a. will not be sacked b. are not sacked
c. will not have been sacked d. would not have been sacked
8. It was _______ we could not go out.
a. such cold that...
Đọc tiếp
6. By the end of next month, we _______ our English course.
a. have completed b. will be completed
c. will have completed d. completed
7. If you had worked harder, you _______.
a. will not be sacked b. are not sacked
c. will not have been sacked d. would not have been sacked
8. It was _______ we could not go out.
a. such cold that b. so cold that c. very so cold d. too cold that
9. Nobody can prevent us from _______ good things.
a. do b. doing c. did d. done
10. Mr. Pike _______ English at our school for 20 years before he retired last year.
a. is teaching b. was teaching c. has been teaching d. had been teaching
11. You should be responsible _______ what you have done.
a. of b. for c. with d. on
12. No longer _______ clean the floor. I have just bought a vacuum cleaner.
a. do I have to b. I do have to c. I have to d. have I to do
13. People do exercise _______.
a. keeping fit b. making fit c. to keep fit d. to make them fix
14. I never forget _______ I went to school.
a. the time first which b. what the first time c. that the time d. the first time when
15. Mary enjoys _______ crossword puzzles when she has free time.
a. making b. doing c. taking d. getting
III.
16. If you want to get _______ in life, you should work harder. (achieve)
17. The roads in our town are being _______. (wide)
18. Thank you for your clear _______. I can understand the lesson thoroughly. (explain)
19. The boring film made Tom fall _______. (sleep)
20. _______ the boy got lost on the way home. (Luck)
21. The _______ of the traffic prevented him from sleeping last night. (noisy)
22, The _______ of nature is at risk. (beautify)
23. Both the US and Russia continue their _______ of the moon. (explore)
24. Vietnam is an _______ country. (agriculture)
25. _______ is one of the biggest businesses in the world. (Advertise)
His painting will be exhibited for the first __ by New Arts gallery
__ Mr. Lam goes to Paris next week, he will see the Eiffel Towel
After running to fetch water , competitors have to come __ to their starting point
Hung said __ he could repair the bicycle for me
___ happend to glass when it is sent to the factory ?
6, this time next year_____chief translator to the French UN delegation
A, he is B, hell be being C, hell be D, hes being
7, You____.Youve made your point clearly enought already
A, neednt continue B, musnt continue C, dont have continue D, wont continue
10, the bill____,so I didnt need to do it
A, was already paid B, has already been paid C, had already been paid D, would already been paid
12, nobady_____from Amanda since she______to the Seychelles
A, heard-went B, has heard-went C, hear...
Đọc tiếp
6, this time next year_____chief translator to the French UN delegation
A, he is B, he'll be being C, he'll be D, he's being
7, You____.You've made your point clearly enought already
A, needn't continue B, musn't continue C, don't have continue D, won't continue
10, the bill____,so I didn't need to do it
A, was already paid B, has already been paid C, had already been paid D, would already been paid
12, nobady_____from Amanda since she______to the Seychelles
A, heard-went B, has heard-went C, heard-has gone D, has heard-has gone
14, _____my pencil ? I left it here somewhere
A, do anyone see B, did anyone see C, is anyone seeing D, has anyone seer
16, ______away this weekend ? Or have you run out of money ?
A, do you so B, are you going C, will you gone D, shall you be going
17, what do you think you_____in ten years ' time ?
A, will do B, will be doing C, will have done D, will have been doing
18, will you let me know the minute you______the news ?
A, hear B, will hear C, will be hearing D, heard
20, what's the matter ? Have you hurt your ankle ? how____it ?
A, have you done B, were you doing C, would you do D, did you do
Exercise 6
:
Choose the best answer for each of the following sentences.
1._____have enough apples, she’ll make an apple pie this afternoon.
A.Should she
B. If she
C. Will she
D. Unless she
2.If you_____to me, you wouldn’t have got so much trouble.
A. listened
B. would listen
C. had listened
D. Would have listened
3.If you don’t know how to spell a word, you_____ look it up in the dictionary.
A. must
B. will
C. should
D. ought
4.If the sun _____, we _____for a walk.
A. shines...
Đọc tiếp
Exercise 6
:
Choose the best answer for each of the following sentences.
1._____have enough apples, she’ll make an apple pie this afternoon.
A.Should she
B. If she
C. Will she
D. Unless she
2.If you_____to me, you wouldn’t have got so much trouble.
A. listened
B. would listen
C. had listened
D. Would have listened
3.If you don’t know how to spell a word, you_____ look it up in the dictionary.
A. must
B. will
C. should
D. ought
4.If the sun _____, we _____for a walk.
A. shines / will go
B. shone / will go
C. shone / would go
D. had shone / would go
5.The campfire _____ if it _____ last night.
A. wouldn’t be cancelled / hadn’t rained
B. wouldn’t have been cancelled / hadn’t rained
C. would have been cancelled / hadn’t rained
D. will be cancelled / rains
6.But for our parents, we _____ successful in life.
A. will never be
B. would never be
C. wouldn’t have be
D. would have never been
7.If I _____ my wallet at home this morning, I _____ money for lunch now.
A. leave / will have
B. didn’t leave / would have
C. hadn’t left / would have
D. hadn’t left / would have had
8.It is too bad, Lam isn’t here. If he _____ here, he _____ what to do.
A. were / would know
B. is / will know
C. had been / would have known
D. was / would know
9.If we _____ the plans carefully, we would not have had so many serious mistakes.
A. study
B. had studied
C. studied
D. were studying
10.I will never talk to you again _____ you apologize me _____ your being rude.
A. if / for
B. unless / for
C. or / of
D. whether / or
11._____if you work harder, you will be sacked.
A. Whether
B. If
C. However
D. Unless
12.I think you should stop smoking.
A. If I am you, I will stop smoking.
B. If I were you, I will stop smoking.
C. If I were you, I would stop smoking.
D. If I had been you, I would stop smoking.
13.If you take the ice out of the fridge, it _____.
A. vaporizes
B. melts
C. heats
D. disappears
14.We should do something to protect water from being polluted _____we will have nothing to drink in the future.
A. if
B. whether
C. or
D. unless
15.Let’s knock on their door to see _____home.
A. if they’re
B. unless they’re
C. whether they were
D. if they were
16.Unless we _____more snow, we can’t go skiing.
A. will have
B. have
C. have had
D. had
17.You’ll fail the exam _____ you start revising.
A. if
B. until
C. when
D. unless
18.Unless you wash the car, you _____not drive it at the weekend.
A. would
B. could
C. have to
D. may
19.If Peter _____his car before the drive, he _____the problem of out of petrol.
A. checked / will not get
B. had checked / would not have got
C. checks / will not have got
D. would be checking / will not have got
20.He stepped on the mine, and it exploded.
A.If he doesn’t step on the mine, it doesn’t explode.
B.If he doesn’t step on the mine, it won’t explode.
C.If he didn’t step on the mine, it wouldn’t explode.
D.If he hadn’t stepped on the mine, it wouldn’t have exploded.
21.
In my experiments, the liquid is cooled to 32ºF. It always freezes.
A.If you cool the liquid to 32 degrees, it froze.
B.If you cooled the liquid to 32 degrees, it would freeze.
C.If you cool the liquid to 32 degrees, it will freeze.
D.If you had cooled the liquid to 32 degrees, it would have frozen.
22.It may rain this afternoon. I hope it doesn’t because I don’t want the match to be cancelled.
A. If it rains, the match is cancelled.
B. If it rains, the match will be cancelled.
C. if it rained, the match would be cancelled
D. If it had rained, the match would have been cancelled.
23.Unfortunately, I don’t know Philosophy, so I can’t answer your question.
A.If I know Philosophy, I can answer your question.
B.If I know Philosophy, I will be able to answer your question.
C.If I knew Philosophy, I would be able to answer your question.
D.If I had known Philosophy, I would have been able to answer your question.
24._____ there are some more ideas, we can end the meeting now.
A. If
B. As if
C. Unless
D. In case
25.If he _____with us now, he _____ the beauty of nature of the National Park.
A. is / can enjoy
B. was / will enjoy
C. has been / would enjoy
D. were / could enjoy
26.If they had searched more carefully, they...the watch sooner.
A. will find
B. would find
C. found
D. would have found
27.If I had got up early, I _____ to have breakfast now.
A. have
B.I had
C. would have
D. would have had
28.I cannot buy a new computer _____ I save enough money.
A. if
B. even if
C. unless
D. as if
29.Most people you meet will be polite to you _____.
A. if you are polite to them
B. if you will be polite to them
C. unless you are polite to them
D. if you were polite to them
30.If you do so, it _____ the matter worse.
A. makes only
B. would only make
C. will only make
D. had only made
31.You _____ English fluently unless you practice it every day.
A. will speak
B. will not speak
C. can speak
D. did not speak
32.Hurry up _____ you will miss the bus and be late for school.
A. if
B. and
C. or
D. as
33.You will get a good seat if you _____ first.
A. come
B. came
C. have come
D. will come
34.Sam will not graduate_____.
A. if he passed all the tests
B. if he does not pass all the tests.
C. unless he passes all the tests
D. unless he had passed all the tests.
35.If I had time, I would go with you.
A.I am free and surely go with you.
B.I am too busy to go with you.
C. I will go with you because I have time.
D. I am free enough to go with you.
36.If Margaret hadn’t been wearing a seat belt, she.... Injured.
A. has been
B. would has been
C. would be
D. would have been
37.If I _____ the rain yesterday, I_____ ill.
A. had not caught / would have been
B. had not caught / would have not been
C. have not caught / were not
D. have not caught / would have been
38.He looked frightened as if he _____ a ghost.
A. sees
B. is seeing
C. has seen
D. had seen
39.What _____if there _____ a serious nuclear accident.
A. will happen / was
B. happens / were
C. would happen / were
D. would happen / had been