问题描述：
名词从句单项选择练习题
An opinion is ______ someone believes is true but has not been proved.
A.that B.what C.which D.whether
请从英语语法上详细讲解一下此题,答案是B,但为什么不选A?
An opinion is ______ someone believes is true but has not been proved.
A.that B.what C.which D.whether
请从英语语法上详细讲解一下此题,答案是B,但为什么不选A?
问题解答：
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