Every possible means _______to prevent the air pollution, but the sky is still not clear. A.are bein

题目简介

Every possible means _______to prevent the air pollution, but the sky is still not clear. A.are bein

题目详情


Every possible means _______to prevent the air pollution, but the sky is still not clear.
A.are being usedB.have been usedC.has been usedD.had been used
题型:单选题难度:偏易来源:不详

答案

C

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