---Peter looked tired and a little absent-minded in class． ---He too late．A.may
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---Peter looked tired and a little absent-minded in class．
---He _____ too late．
A.may stay up
B.could stay up
C.should have stayed up
D.must have stayed up
试题答案
D
考查情态动词表推测的用法。must have done 表示对过去事情肯定的推测，句意： 皮特看起来很累在课上有点心不在焉。他一定熬夜熬得太晚了。所以选D。