—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

D


解析:

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

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