Did she do her homework last night?(用at seven o'clock last night代替last night)

问题描述:

Did she do her homework last night?(用at seven o'clock last night代替last night)

答案:Was she doing her homework at seven o'clock last night?
在某个时间点一般用进行时,表示某个时刻某人在干什么.
at seven o'clock last night昨晚7点钟,所以应该用过去进行时.