Every possible means ________ to prevent the air pollution,but the sky is still not very clear.
发布时间:2021-08-15
A.were using
B.have used
C.has been used
D.was used
试卷相关题目
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A.have won
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C.are won
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A.is playing
B.have played
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A.comes; are
B.come; is
C.come; are
D.comes; is
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A.is, is
B.are; are
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