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> Every possible means _______to prevent the air pollution, but the sky is still not clear. A.are bein
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 used
B.have been used
C.has been used
D.had been used
题型:单选题
难度:偏易
来源:不详
答案
C
略
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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.
答案