题目内容
17.[1995全国] 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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| 题目考察由否定词not
until引导时，句子部分倒装
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