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Not until all the fish died in the river ______ how serious

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

考查倒装句。否定词放在句首主句使用部分倒装,助动词提前,句意:直到河里所有的鱼都死了,村民们才意识到污染是多么的严重呀。根据语境选C。