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、did the villagers realize
B、the villagers realized
C、the villagers did realize
D、didn’t the villagers realize

答案A

解析 not until引导状语从句位于句首时，主句要倒装，答案为A。

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