问题: 选择，
Not until all the fish died in the river___ how serious the pollution was.
A, did the villagers realize
B, the villagers realized
C, the villagers did realize
D, didn't the villagers realize
帮忙分析一下这道题.选哪个为什么
解答:
Not until all the fish died in the river
didthe villagers realize how serious the pollution was.
Not until 在句首时后用倒装语序
然后根据句意
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