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  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:1754

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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They ______on the program for