Tim looks so frightened and upset. He________something terrible

A. must experience

B. can have experienced

C. should have experienced

D. must have experienced

Mark the letter A, B, c, or D on your answer sheet to indicate the correct answer to each of the following questions.
________human beings have relatively constant body temperature.

A. Alike all mammal

B.Like all mammals

C. Like all marnmal

D. Alike all mammals

A. encourage the real estate market 

B. obstruct reforms to access universal urban housing 

C. hinder the housing purchase process 

D. reject to mount the housing fee