Not until all the fish die in the river how serious the pollution was.
A. did the villagers realize
B. the villagers realized
C. the villagers did realize
D. didn’t the villagers realize
网友回答
(答案→)A. did the villagers realize
B. the villagers realized
C. the villagers did realize
D. didn’t the villagers realize
解析：考查部分倒装句，not until放在句首时，从句不倒装，主句部分倒装，把助动词，be动词或情态动词提到主语前面。句意：直到河里的鱼都死了，村民才知道污染是多么严重。选A。