Did she do her homework last night?(用at seven o'clock last night代替last night)解释为什么要这样改

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Did she do her homework last night?(用at seven o'clock last night代替last night)
解释为什么要这样改

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?
at seven o'clock last night 昨天晚上七点,是一个时间点
所以在那个点应该是正在做什么
所以用过去进行时

Was she doing her homework at seven o'clock last night?过去某一时刻用过去进行时