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    精英家教网 > 高中英语 > 题目详情
    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 workingB．had worked; were still working
    C．have been working; have workedD．have worked; are still working
    A
    此题的时间参照点是before I joined them,，所以第一个空应该用过去完成进行时，第二个空根据时间now用现在进行时。
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