Not until the press reported the pollution why the water supply had been cut off. A. people knew B. people had known C. did people know D. had people known 题目和参考答案——青夏教育精英家教网——

题目内容

Not until the press reported the pollution _____________ why the water supply had been cut off.

A. people knew B. people had known

C. did people know D. had people known

C

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