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    【题目】They __________ on the program for almost one week before I joined them, and now we __________ 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】A

    【解析】根据前一个分句中的时间状语从句before I joined them 和后一个分句中的时间状语now可知，谓语动词的动作发生在过去的过去，并且一直延续下去，而且现在还在进行着。所以，第一个空应该用过去完成进行时；第二个空应用现在进行时。

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