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题型:单选题 题类:常考题 难易度:普通

仁爱科普版九年级上Unit 4 Topic 3 China is the third nation that sent a person into space.专题练习:定语从句

This machine, ______ for many years, is still working perfectly.

A、after which I have looked B、which I have looked after C、that I have looked after D、I have looked after
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