【题目】It is not until all the fish died in the river ________how serious the pollution was.
A. did the villagers realize B. that the villagers realized
C. the villagers did realize D. didn’t the villagers realize
在线课程【答案】B
【解析】考查not until的强调句型。句意：直到河里的鱼都死光了,村民们才意识到污染是多么严重。此处是It is not until ---that---，的强调句型，故答案为B。