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 realize-高中英语-n多题

◎ 题干

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

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◎ 解析

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