题目内容

2.____caused the accident is still a complete mystery.(  )
A.WhatB.ThatC.HowD.Where

分析 什么造成这起事故依然是个谜.

解答 答案:A
分析句式可知,"____caused the accident"是主语从句,在从句里缺少主语,所以用what引导.how和where在句子里做状语,不符合.that引导主语从句不做成分,故答案选A.

点评 考生须掌握名词性从句的特征,注意分析句子结构并在具体 语境中灵活使用.

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