作业帮what____he____do at nine o'clock yesterday?(do)
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what____he____do at nine o'clock yesterday?(do)
what____he____do at nine o'clock yesterday?(do)
what____he____do at nine o'clock yesterday?(do)
what was he doing at nine o'clock yesterday?
其实很多人填did do 并不错,因为填着有一种探究的以为——昨天九点他做了什么啊?
那要看上下文,光这个句子看不出一般过去式.因为它强调结果
因此这里用过去进行时更好,即昨天九点的时候他在干嘛?指他在做什么的状态,比较通顺
如果你是初中学生,这个句子很容易碰到
what did he do at nine o'clock yesterday
what was he doing at nine o'clock yesterday?
这里要用过去进行时态， 昨天晚上9点钟他正在干什么？
did
what did he do do at nine o'clock yesterday?
在此第二个空的do表示强调：昨晚九点他到底干什么了？
what was he doing ...