题目内容

The best way to prevent the air polluting _____ , but the sky is still not clear.
A．is usedB．are usedC．has been usedD．have been used
C
考查主谓一致与语态。根据上下文可知最好的方法已经被使用了，但是天空仍然不晴朗。可以反应出过去发生的事情对现在的影响。the best way是单数形式，所以谓语动词用单数。句意：阻止空气污染的最好的方法已经被使用了，但是天空仍然不晴朗。
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