【題目】Every possible means ________ to prevent the air pollution, but sky is still not clear.

A.is usedB.are usedC.have usedD.has been used

【答案】D

【解析】

考查主謂一致和動詞時(shí)態(tài)語態(tài)。句意:所有可能的方法都被用來防止空氣污染,但天空仍然不明朗。means當(dāng)名詞解釋為"方法",單復(fù)數(shù)同型,且every+主語,謂語動詞用單數(shù);means與動詞use之間是被動關(guān)系,根據(jù)語境“所有的方法都用了”,應(yīng)該用現(xiàn)在完成時(shí)的被動語態(tài)。故選D。

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