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英语语法疑惑What the revolutionaries______ doing_____good to the w

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英语语法疑惑
What the revolutionaries______ doing_____good to the working people.
A are ,are B,were,is
选择什么?
话说 what引导的主语从句,谓语动词的单复数取决于作表语的名词的单复数.
那么本题做表语的名词是哪个?
英语语法疑惑What the revolutionaries______ doing_____good to the w
What the revolutionaries were doing is good to the working people.
主语从句谓语动词一般用单数.但要注意以下情况:由what引导的主语从句,谓语动词通常用单数;所指的具体内容若是复数意义,谓语动词一般用复数形式