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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