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:為了防止空氣污染,每 種可能的辦法都試過了,但是天空還是不晴朗。means意為“辦法,方法”,單復(fù) 數(shù)同形,因?yàn)榇颂幱衑very修飾,故應(yīng)看 作單數(shù);由句意可知,此處應(yīng)用現(xiàn)在完成 時(shí)的被動(dòng)語(yǔ)態(tài),故選C項(xiàng)。

題目來(lái)源:2016年周測(cè)月考直通高考高中英語(yǔ)必修3外研版 > 周內(nèi)課時(shí)練2 Period Two Introduction & Reading and Vocabulary—Language Points

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