Every possible means ______ to prevent the air pollution, but the sky is still not clear. 

A. has been used　B. have been usedC. is used　D. are used

 

A

【解析】

試題分析：句意：每種可能的方式都被使用過來阻止空氣污染，但是天空還是不清楚。Means是單復(fù)數(shù)同形的單詞，因?yàn)檫@里被every修飾，所以means這里是單數(shù)，謂語用單數(shù)，排除BD，從but the sky is still not clear. 可知這里強(qiáng)調(diào)的是已經(jīng)被使用了，用現(xiàn)在完成時，選A.

考點(diǎn)：考查主謂一致和時態(tài)

 

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