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    精英家教网 > 高中英语 > 题目详情
    18．The students__________ their experiments when a stranger broke into the lab．（　　）
    A．had been doingB．have been doingC．would be doingD．were doing

    分析 当这个陌生人闯入实验室的时候，这些学生们正在做实验．

    解答 答案：D．根据when a stranger broke into the lab可知当这个陌生人闯入实验室的时候，这些学生们正在做实验，所以谓语动词do用过去进行时，故答案为D．其他选项表示的时态分别是：A、过去完成进行时  B、现在完成进行时  C、过去将来进行时．

    点评 考查过去进行时．过去进行时表示过去的某个点正在进行的动作，而将来进行时表示将来的某个点正在进行的动作．

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