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    Air pollution is getting more and more serious, so we must take action ________ it is too late.
    A．before B．after
    C．until D．when
    A
    选A　考查状语从句。句意：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”。
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