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、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置于句首时，从句要从采用部分倒装的形式，即将助动词提前到主语前，如果没有助动词，则需添加助动词does或did，并将其置于主语之前。故选A。
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