Not until all the fish died in the river how serious the problem of water pollution was. A. did they realize B. they did realize C. had they realized D. they had realized 题目和参考答案——青夏教育精英家教网——

题目内容

Not until all the fish died in the river how serious the problem of water pollution was.

A. did they realize B. they did realize C. had they realized D. they had realized

A

解析:

略

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