2. 外语
  3. Not until all the fish died in the river ______ how serious the pollution was.

Not until all the fish died in the river ______ how serious the pollution was.

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问题 Not until all the fish died in the river ______ how serious the pollution was.
选项 A、the villagers realized
B、the villagers did realize
C、did the villagers realize
D、didn’t the villagers realize
答案C
解析
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