题目内容

We still don’t know what _________ while we were away from home.
A.had happenedB.was happenedC.has happenedD.happened
D

试题分析:句意:我们仍然不知道在我们离开家时发生了什么。Happen发生,是一个不及物动词。根据while we were away from home可知该用一般过去时,所以选D。
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