—Look, John’s fallen asleep.

— Oh, he _______ too late last night.

A. might sit up     B. should have sat up      C. could sit up       D. must have sat up

 

【答案】

 D

從by now看應該是完成時態(tài)，排除B、C，從It usually takes four days看，應是ought to“應該”，選D。

 

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