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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

試題分析：句意：因為大霧，沒有人知道他發(fā)生了什么事。結合語境可知賓語從句中描述的是過去某時前已經完成的動作，故用過去完成時態(tài)。Happen的主語一般為物，happen to sb發(fā)生在某人身上，故選B，
點評：英語中的時態(tài)主要是借助于時間狀語與上下文語境來進行判斷。解答此類題型，首先要注意句子中的時間狀語，如果沒有則要通過分析上下文，結合語境來判斷句子的時態(tài)。
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