题目内容

No one knew what        because of the thick fog.
A．he had happenedB．had happened to him
C．had he happenedD．has happened to him
B

试题分析：句意：因为大雾，没有人知道他发生了什么事。结合语境可知宾语从句中描述的是过去某时前已经完成的动作，故用过去完成时态。Happen的主语一般为物，happen to sb发生在某人身上，故选B，
点评：英语中的时态主要是借助于时间状语与上下文语境来进行判断。解答此类题型，首先要注意句子中的时间状语，如果没有则要通过分析上下文，结合语境来判断句子的时态。
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