The best way to prevent the air polluting _____ , but the sky is still not clear
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The best way to prevent the air polluting _____ , but the sky is still not clear.A.is used | B.are used | C.has been used | D.have been used |
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答案
C |
解析
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。 |
举一反三
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