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    (2013·潍坊高考模拟)Air pollution is getting more and more serious，so we must take action________it is too late.
    A．beforeB．after
    C．untilD．when
    A
    考查状语从句。句意为：空气污染越来越严重，所以我们必须趁现在还来得及的时候采取行动。根据句意可知，应用before，表示“在……以前”。
    答案：　A
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