Every possibles means ( )to prevent the air pollution,but the sky is still not clear.A.is used B.are used C.has been used D.have been used哪一个?为什么?

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Everypossiblesmeans()topreventtheairpollution,buttheskyisstillnotclear.A.isusedB.areusedC.hasbeenuse

Every possibles means ( )to prevent the air pollution,but the sky is still not clear.A.is used B.are used C.has been used D.have been used哪一个?为什么?
Every possibles means ( )to prevent the air pollution,but the sky is still not clear.
A.is used B.are used C.has been used D.have been used
哪一个?为什么?

Every possibles means ( )to prevent the air pollution,but the sky is still not clear.A.is used B.are used C.has been used D.have been used哪一个?为什么?
C
从句意看出是已经用过了,所以用完成时;因为前面是every,而means 单复同型,这里是单数,所以选C

选C,强调个体,用单数