题目内容

____ caused the accident is still a complete mystery.
A.WhatB.ThatC.HowD.Where
A
what在主语从句中作主语,即作谓语动词caused的执行者。在下面的例句中,that不充当任何成份,只起语法连接作用(因为句子本身不缺成分):
That the former Iraq president Saddam was captured has been proved.
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