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    4．-I saw Lucy and her boyfriend in the park at nine yesterday evening．
    -impossible．She          the Internet with me in my home then．（　　）
    A．surfedB．had surfedC．would surfD．was surfing

    分析 ---昨晚九点我看见露西和她的男友在公园里．
    ---不可能．那时她正在我家和我一起上网．

    解答 答案：D．根据impossible可知She          the Internet with me in my home then表示那时她正在我家和我一起上网，所以用过去进行时，答案是D．其他选项的时态分别是A一般过去时；B过去完成时；C过去将来时．

    点评 考查过去进行时．
    一般过去时表示过去某个时间里发生的动作或状态；过去习惯性、经常性的动作、行为，而过去进行时表示过去某时正在进行的状态或动作．

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