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【题目】_______ caused the accident has not been found out yet.

A.WhatB.Which

C.The thingD.That

【答案】A

【解析】

考查主语从句。句意:造成事故的原因还没有查明。此处为主语从句,从句中缺少主语,应该用what引导,故A项正确。

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