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  I have no idea what _____ while I was asleep.

A.has happened B.could happen C.had happened D.happened

D

解析试题分析:考查动词时态。从语境可知发生的事情应该是在说话人睡觉期间,应该用一般过去时,而C选项过去完成时需有过去的时间或过去的动作做对照才可以使用, B选项表示将来可能发生,不合句意,故D选项正确。句意:我不知道当我睡着的时候发生了什么事情。
考点:考查动词时态。

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