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题文

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 worked, were still working
B.had been working, are still working
C.have been working, have worked
D.have been worked, are still working
科目 英语   题型 单选题   难度 中等
知识点: 动词语态
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