问题
选择题
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
考查倒装句。Not until放在句首时，后面的主句使用部分倒装句。结合句意可知A正确。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。