caused the accident is still a complete mystery. A. WhatB. ThatC. HowD. Where
caused the accident is still a complete mystery. A. WhatB. ThatC. HowD. Where
发布时间：2020-08-17 03:36:03
caused the accident is still a plete mystery. A. What B. That C. How D. Where
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(答案→)A. What B. That C. How D. Where 解析：考查主语从句。本句中的主语从句what caused the accident,what引导起主语从句，并在句中做主语。CD项只能在句中做状语，that引导主语从句，不能充当任何成分。句意：导致事故的原因还是一个迷。故A正确。