题目内容
从A、 B、 C、 D四个选项中，选出可以填入空白处的最佳选项.
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
答案：A
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