Has the teacher finished marking the exam papers SORRY,I DON'T KNOW.He _______(mark) them
问题描述：
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
答
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）在完成他们过去时就不能表示一下午的动作吗不可以，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