He looks so unhappy that he seems to ----- the sad news.

问题描述:

He looks so unhappy that he seems to _____ the sad news.
空格处用know还是have known,为什么呢?
1个回答 分类:英语 2014-10-12

问题解答:

我来补答
用have known,现在完成时表示过去所做的事情对现在的影响和意义!
 
 
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