题目内容

He is an hour late by now．He         last night．
A．must stay upB．should stay up
C．must have stayed up D．should have stayed up
C
考查虚拟语气。句意：到现在他已经迟了一个小时。他昨晚肯定熬夜了。“must+have+done”表示对过去事情的肯定推测，译成“一定做过某事”。故选C。
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