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Has the teacher finished marking the exam papers SORRY,I DON

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Has the teacher finished marking the exam papers SORRY,I DON'T KNOW.He _______(mark) them
Has the teacher finished marking the exam papers
SORRY,I DON'T KNOW.He _______(mark) them in the office yesterday afternoon.
为什么用was marking 而不是marked
Has the teacher finished marking the exam papers SORRY,I DON
marked是你只看到了yesterday,我们可以通过句意得出,他在昨天下午(一直)在完成他们
再问: 过去时就不能表示一下午的动作吗
再答: 不可以,他在昨天下午(一直)在完成他们,was marking是延续的动作,而marked只是强调的是一个过去的(状态),不能表示一下午的动作