So sudden that the residents had no time to escape.
A. was the earthquake
B. did the earthquake
C. the earthquake did
D. the earthquake was
网友回答
(答案→)A. was the earthquake
B. did the earthquake
C. the earthquake did
D. the earthquake was
解析：考查倒装句。So+adj/adv放在句首时，后面构成部分倒装句。B选项应该改为did the earthquake
Happen;句意：地震爆发地如此突然以至于居民没有时间逃跑。