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    精英家教网 > 高中英语 > 题目详情

    All possible means ________ been taken to stop the river ________．


    1. A.
      have; polluting
    2. B.
      has; polluted
    3. C.
      has; from polluted
    4. D.
      have; being polluted
    D
    means为单复数同形词，因为有all修饰，所以为复数名词，谓语应用复数形式；第二空考查stop…(from)doing的用法，因为河水会被污染，故用被动语态。
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