11._____caused the accident has not yet been found.A、WhichB、WhicheverC、WhatD、

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问题 11._____caused the accident has not yet been found.

选项 A、Which
B、Whichever
C、What
D、Whatever

答案 D

解析名词性分句。首先，谓语动词之前多为主语从句；其次，此主语从句中所缺的成分是主语，名词性质，故排除限定词性质的A和B。what和whatever区别在于前者确定特指，后者非确定特指，比较：What caused the accident was a broken bottle．

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