Robert is said ______ abroad ,but I don’t know what country he studying in .

问题描述:

Robert is said ______ abroad ,but I don’t know what country he studying in .
A .to have studied B .to study C .to be studying D .to have been studying
选择哪个啊?
been 怎么使用?

D
have been是现在完成进行时
表示已经完成但是还没结束
也就是持续在做的事情
这里说他去国外学习了
他还在国外学
所以用have been studyingIf he______ tomorrow ,he would find Mr.Wang in the office.A.comesB.will comeC.should comeD.come 选择哪个呢?谢谢~~