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9. Every possible means to prevent the air pol- lution,but the sky is still not clear.

   A. is used        B. are used

   C. has been used   D. have been used

9. C

9. C解析:句意:为了防止空气污染,每 种可能的办法都试过了,但是天空还是不晴朗。means意为“办法,方法”,单复 数同形,因为此处有every修饰,故应看 作单数;由句意可知,此处应用现在完成 时的被动语态,故选C项。

题目来源:2016年周测月考直通高考高中英语必修3外研版 > 周内课时练2 Period Two Introduction & Reading and Vocabulary—Language Points

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