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    精英家教网 > 高中英语 > 题目详情

    I ________ for three hours when I suddenly became sick．


    1. A.
      had been working
    2. B.
      would work
    3. C.
      have worked
    4. D.
      am working
    A
    句意是“我一直工作了三小时，这时我突然觉得不舒服”。此处要用过去进行时表示到过去某个时间为止一直持续的状态。
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