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The train is to start soon and Mary hasn’t turned up. What _____ have happened to her?
A.canB.mightC.mayD.should
A

试题分析:考查情态动词表示推测。Can have done可能做了某事;might/may have done也许做了某事;should have done本不应该做某事;句意:火车就要出发了,Mary仍然没有出现。她可能发生了什么事情呢?根据句意是对过去发生的事情的推测。故A正确。
点评:本题考查了其它动词表示推测的用法。如果是对过去发生的事情进行推测,使用“情态动词+have done”如果是对现在的情况进行推测,使用“情态动词+动词原形”构成。同时要注意情态动词表示虚拟语气的用法。
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