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More and more people have come to realize that if we had taken effective measure

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More and more people have come to realize that if we had taken effective measure

More and more people have come to realize that if we had taken effective measures much earlier, the air quality ______ so seriously now.

A.is not polluted

B.would not be polluted

C.had not been polluted

D.would not have been polluted

试题答案

B

试题

标签：weifthathadmeasures

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