问题补充:
A boy with two dogs when the earthquake rocked the city.
A. were sleeping
B. is asleep
C. was sleeping
D. are asleep
答案:
A. were sleeping
B. is asleep
(答案→)C. was sleeping
D. are asleep
解析:句意:当这个城市发生地震时,一个男孩和两条狗正在睡觉。句中有when所引导的过去的时间状语,句子用过去进行时,故选C