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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 villagers realized

C. the villagers did realize     D. didn’t the villagers realize

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

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

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