Every possible means ___ to prevent the air pollution, but the sky is still not
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Every possible means ___ to prevent the air pollution, 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
试题分析:原句意思是防治污染的每种可能的方式都被使用了,但是天空还是不明亮。首先我们看到means(方法)这个词,它是单数和复数的形式一样的。再看Every possible means,每个可能的方法,是单数。排斥B和D,C表示已经被使用了,现在完成时态与后面的but结果相对应,即先后关系。A被使用了。没有体现先后关系,故选C。 点评:统观全句来选答案。从every可知前半句就该用单数形式;从后半句中的still可知,前半句中的内容是已经发生的,应该用完成式。结合起来就可以得到答案。 |
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