Air pollution is getting more and more serious, so we must take action          it is too late.
A．before B．a(chǎn)fter C．until D．when
A

試題分析：句意：空氣污染越來越嚴(yán)重，所以我們必須在它很晚之前采取措施。before 在……之前； after在……之后； until直到……為止； when在……時(shí)候。根據(jù)句意故選A。
點(diǎn)評：本題難度適中。判斷從句中用哪個(gè)連詞，需用記住連詞的用法，在句中的作用，連詞也是高考的熱點(diǎn)，需要考生平時(shí)多練習(xí)。需要考生會(huì)分析句子成分理解句意。
即學(xué)即練：I didn't wake up      I heard the alarm clock.
A. before          B. after              C. until          D. when
解析C。句意：直到聽到鬧鐘的鈴聲我才醒來。
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