Air pollution is getting more and more serious, so we must take action it is too late.A.

发布时间：2020-08-17 09:33:19

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

网友回答

(答案→)A. before
B. after
C. until
D. when
解析：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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