__________ caused the accident is still a complete mystery.A.What B.That C.How

__________ caused the accident is still a complete mystery.A.What B.That C.How

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__________ caused the accident is still a complete mystery.
A.What B.That C.How D.Where

答案
A
解析
此题考查what引导名词性从句作主语。
举一反三
It worried Mary a lot__________she would pass the college entrance examinations.
A.whetherB.if C.that D.how

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Shanghai has taken on a new look.It isn’t like__________it used to be.
A.whatB.how C.that D.which

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__________ is no possibility__________Bob will win the first prize in the match.
A.There;that B.It;thatC.There;whether D.It;whether

题型:不详难度:| 查看答案
Little Tommy was reluctant to tell the schoolmaster__________he had done the day before.
A.that B.how C.what D.where

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The old man smiled when he saw how pretty__________up to be during the past few years.
A.had his daughter grown B.would his daughter grow
C.his daughter would grow D.his daughter had grown

题型:不详难度:| 查看答案
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