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    It is well known to us all that a lot of rivers _______by factories.
    A．are pollutingB．have been polluting
    C．are being pollutingD．are being polluted
    D
    考查时态语态，river和pollute是被动关系，但四个选项只有D项是现在进行时的被动，句意是：众所周知的是很多河流正在被工厂污染。选D。
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