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They _____ on the program for almost one week before I joined them, and now we _____ on it as no go...
题目内容:
They _____ on the program for almost one week before I joined them, and now we _____ on it as no god 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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