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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
科目 英语   题型 单选题   难度 中等
知识点: 动词语态
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