do you know that he is right?和do you know if he is right?哪个正

问题描述:

do you know that he is right?和do you know if he is right?哪个正确?为什么?
1个回答 分类:英语 2014-11-29

问题解答:

我来补答
后面那个正确,if 是用在疑问句中的
 
 
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