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题目
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________ caused the accident is still a complete mystery.
A.WhatB.That C.HowD.Where

答案

解析
A
解析 主语从句中缺少主语,而能在主语从句中既充当主语又起引导作用的只有what。
核心考点
试题【________ caused the accident is still a complete mystery.A.WhatB.That C.HowD.Whe】;主要考察你对名词性从句等知识点的理解。[详细]
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