—Peter looked tired and a little absent-minded in class．
—He _____ too late．
A．may stay upB．could stay up
C．should have stayed upD．must have stayed up
D
考查情態(tài)動詞表推測的用法。must have done 表示對過去事情肯定的推測，句意： 皮特看起來很累在課上有點心不在焉。他一定熬夜熬得太晚了。所以選D。
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