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    精英家教网 > 高中英语 > 题目详情
     I have no idea what _____ while I was asleep.
    A．has happenedB．could happenC．had happenedD．happened
    D

    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。
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