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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 146

They _____ on the program for almost one week before I joined them, and now, we ____on it as no good results have come out so far.

A.had been working; are still working
B.had worked; were still working
C.have been working; have worked
D.have worked; are still working
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