— 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

 

表示對過去發(fā)生的情況的推測，應(yīng)該用may / might have done結(jié)構(gòu)。should have done意為“本應(yīng)該做某事而沒做”，must have been doing表示對過去某段時間內(nèi)一直在進(jìn)行的動作的肯定推測。

 

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