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

 

A

【解析】選A　考查狀語從句。句意：空氣污染越來越嚴重，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，應用before，表示“在……以前”。

 

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