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    All possible means ___ been tried to stop the air______.
    A．has, pollutedB．have, polluting
    C．have, being pollutedD．has, being polluted
    C
    第一空考查主谓一致means是单复同形的名词本句中有all视为复数；第二空考查短语stop …(from)…“阻止做某事”空气应是被污染要用动名词的被动式。句意为：已经尝试了所有的方法来阻止空气被污染。选C
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