________ caused the accident is still a complete mystery.A.WhatB.That C.HowD.Where-高三英语

题目简介

________ caused the accident is still a complete mystery.A.WhatB.That C.HowD.Where-高三英语

题目详情

________ caused the accident is still a complete mystery.
A.WhatB.That C.HowD.Where
题型:单选题难度:中档来源:不详

答案

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。

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