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问题

Not until all the fish died in the riv


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

  • Adid the villagers realize
  • Bthe villager srealize
  • Cthe villagers did realize
  • Ddidn't the villager srealize
参考答案
参考解析:

Not until前置要用倒装,应排除B、C。Not否定词已在句首,didn’t中的否定与之重复,所以答案为A。

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