◎ 题干
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
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“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; a…”主要考查了你对  【现在进行时】【过去完成进行时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。