问题
选择题
.He said that not until the heavy snow blocked the express ______ how serious the weather was.
A．did the villagers realize
B．the villages realized
C．the villages did realize
D．didn’t the villagers realize
答案
答案：A
not until 放在句首用部分倒装，有因本身为否定，所以后面用肯定形式。