题目内容

— Is Jason all right? He looks so tired!

  — Not sure. He ______ deep into the night yesterday. He’s having an exam soon.

A. may have studied     

B. should have studied

C. might study       

D. must have been studying

A

 

表示对过去发生的情况的推测,应该用may / might have done结构。should have done意为“本应该做某事而没做”,must have been doing表示对过去某段时间内一直在进行的动作的肯定推测。

 

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