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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 are still working on it as no good results have come out so far.
    A．have workedB．had worked
    C．have been workingD．had been working
    D
    考查时态。句意：在我加入他们之前，他们一直在这个项目上工作了将近一个星期。结合语境可知本句描述的在过去已经完成的正在进行的动作，故用过去完成进行时态，选D。
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