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问题详情

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; were still working

时间：2021-09-02 00:36 关键词：青书学堂西安石油大学石油工程技术大学英语I（上）

答案解析

A

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