Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions
The marathon runner________for nearly one hour and a half when she________to the pavement.
A. has been running/ collapsed
B. were running /collapsed
C. had been running / collapsed
D. ran / had been
for+ khoảng thời gian => chia thì hoàn thành => đáp án B và D loại.
A cũng loại vì không cùng thì. Do vậy, đáp án là C.