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        1. 【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(dòng)詞時(shí)態(tài)語(yǔ)態(tài)。句意:所有可能的方法都被用來(lái)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(yǔ),謂語(yǔ)動(dòng)詞用單數(shù);means與動(dòng)詞use之間是被動(dòng)關(guān)系,根據(jù)語(yǔ)境“所有的方法都用了”,應(yīng)該用現(xiàn)在完成時(shí)的被動(dòng)語(yǔ)態(tài)。故選D。

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