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They ______ on the project for almost one month before I joined them, and now we ______ on it as no ...
题目内容:
They ______ on the project for almost one month 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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