Not until all the fish died in the river how serious the pollution was. A. did the villa

问题补充：

Not until all the fish died 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

答案：

(答案→)A. did the villagers realize

B. the villagers realized

C. the villagers did realize

D. didn’t the villagers realize

解析：

A。以not until开头的句子，主句要用部分倒装。