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    精英家教网 > 高中英语 > 题目详情

    The water will be polluted unless some measures _____.
    A．will be takenB．are being takenC．are takenD．were taken
    C
    考察时态及语态。句意：除非采取了一些措施，否则这些水会被污染。句子描述的是一个过去的动作，故用过去时态，measures是take的动作对象，故用被动语态，选D。
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