Question

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

Answer 1

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。

Answer 2

Was she doing her homework at seven o'clock last night?

昨天晚上七点她在做作业吗？

在过去某一时刻正在做的事情，使用过去进行时：

be的过去式+ doing sth

be doing
基本翻译
做；现在进行时；表达当时的行动（状态）
网络释义
be doing:现在进行时 | 表达某种语气 | 进行时

Answer 3

你好, 应该是：

Was she doing her homework at seven o'clock last night?

昨天晚上七点她在做作业吗？
过去进行时
f~~~~~~~~~~～～~~~~祝你进步，如对你有帮助，请及时采纳~~~~~~~~~~~~~~~~~~

Answer 4

Was she doing her homework at seven o'clock last night?
这时候具体到一个点，要用过去进行时~
祝：学习进步，更上一层楼！ (*^__^*)
不明白的再问哟，请及时采纳，多谢！