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状语从句中,主句主语if a book is in english ,( ) means slow progressed for you.A.as B.which C.what D.that为啥只能选that?

题目详情
状语从句中,主句主语
if a book is in english ,( ) means slow progressed for you.
A.as B.which C.what D.that
为啥只能选that?
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答案和解析
前三个都有实际意义,只有that可有可省略.