【題目】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

【答案】A

【解析】句意：空氣污染越來(lái)越嚴(yán)重，所以我們必須在為時(shí)已晚之前采取行動(dòng)。

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