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

分析 什么造成這起事故依然是個(gè)謎．

解答 答案：A
分析句式可知，"____caused the accident"是主語(yǔ)從句，在從句里缺少主語(yǔ)，所以用what引導(dǎo)．how和where在句子里做狀語(yǔ)，不符合．that引導(dǎo)主語(yǔ)從句不做成分，故答案選A．

點(diǎn)評(píng) 考生須掌握名詞性從句的特征，注意分析句子結(jié)構(gòu)并在具體 語(yǔ)境中靈活使用．

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