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