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

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

A.did the villagers realize

B.the villager srealize

C.the villagers did realize

D.didn't the villager srealize

参考答案:

ANot 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。