问题
选择题
He is an hour late by now．He last night．
A．must stay up
B．should stay up
C．must have stayed up
D．should have stayed up
答案
答案：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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