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In order to keep the balance of ecosystem, every possible means _______to deal with the problems of the over-exploiting of natural resources.
A.has tried B.has been triedC.have takenD.have been taken
B

試題分析:考查主謂一致和語(yǔ)態(tài)。Means(方式,方法)是一個(gè)單復(fù)數(shù)同形的名詞。本題means前面有every修飾,說明本句中的means是一個(gè)單數(shù)形式,故謂語(yǔ)部分使用單數(shù)形式,排除CD。句意:為了保持生態(tài)的平衡,每一種可能的方式都已經(jīng)被使用了來處理過度使用自然資源的問題。故使用被動(dòng)語(yǔ)態(tài)。B項(xiàng)正確。
點(diǎn)評(píng):Means(方式,方法)是一個(gè)單復(fù)數(shù)同形的名詞。Every后面要加單數(shù)名詞,如every one等;all后面要接復(fù)數(shù)名詞。本題的means前面加了every說明該詞在本句中是單數(shù)形式,故謂語(yǔ)動(dòng)詞也使用單數(shù)形式。
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