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
選A　考查狀語從句。句意：空氣污染越來越嚴(yán)重，所以我們必須趁現(xiàn)在還來得及的時候采取行動。根據(jù)句意可知，應(yīng)用before，表示“在……以前”。
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