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He paid the boy 10 dollars for washing ten windows ,most of___had not been cieaned for yearsA them B those C that D which我认为答案是A 可是为什么是D 求详解

题目详情
He paid the boy 10 dollars for washing ten windows ,most of___had not been cieaned for years
A them B those C that D which我认为答案是A 可是为什么是D 求详解
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答案和解析
most of是一个定语从句,需要用代词,空格处指代的是物体ten windows,所以要用指代物体的代词which.