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

题目简介

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

题目详情

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
题型:单选题难度:中档来源:不详

答案

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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