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      caused the accident is still a complete mystery.
A.WhatB.ThatC.HowD.Where
A

试题分析:原句意思是,什么造成了这次事故依然是个谜。分析句子结构,这是一个主从复合句,包括一个主语从句。主语从句中缺主语,所以只能用 what,故用答案为A。
点评:这是一个主从复合句,包括一个主语从句。主语从句中缺主语,所以能用 what。
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