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    精英家教网 > 初中英语 > 题目详情
    Many rivers ________.

    A. have became polluted
    B. have become polluted
    C. have been polluting
    D. have become polluting
    B
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    科目：初中英语 来源：月考题 题型：单选题

    Many rivers ________.
    [     ]
    A. have became polluted
    B. have become polluted
    C. have been polluting
    D. have become polluting

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