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
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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
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

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