Robert is said___abroad,but I don't know what country he studied in.a.to have studiedb.to studyc.to be studyingd.to have been studying.这个是现在完成时么?为什么a选项不是to have been studied?什么时候要用上"been"这个单词的?

Robert is said___abroad,but I don't know what country he studied in.a.to have studiedb.to studyc.to be studyingd.to have been studying.这个是现在完成时么?为什么a选项不是to have been studied?什么时候要用上"been"这个单词的?
Robert is said___abroad,but I don't know what country he studied in.
a.to have studied
b.to study
c.to be studying
d.to have been studying.
这个是现在完成时么?为什么a选项不是to have been studied?什么时候要用上"been"这个单词的?

Robert is said___abroad,but I don't know what country he studied in.a.to have studiedb.to studyc.to be studyingd.to have been studying.这个是现在完成时么?为什么a选项不是to have been studied?什么时候要用上"been"这个单词的?
这个题很有意思,很不错,很容易选错C.
这个题的正确答案是A
这个题的关键是句未的动词studied,是过去式,说明Robert已经不在国外学习了,已经完成了该动作,符合完成时态的定义.这个题如果把studied改为studies,那么这个题就选C,表示正在进行.
你问的问题,什么时候要用上been,这很简单,been+过去分词,表示被动语态的完成式.而题目中,是主动语态,不是被动语态,所以不用been.

正确答案：A
首先，A不能用to have been studied，因为这是被动语态，而学习是Robert的主动动作，另外，不选D是因为后面半句的提示可以说明这是过去发生的事情，所以不能用现在完成进行时。

Robert is said___abroad,but I don't know what country he studied in.
a.to have studied
b.to study
c.to be studying
d.to have been studying.
据说罗伯特在外国学习，可是我不知道他在哪个国家。
选A。

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Robert is said___abroad,but I don't know what country he studied in.
a.to have studied
b.to study
c.to be studying
d.to have been studying.
据说罗伯特在外国学习，可是我不知道他在哪个国家。
选A。
have done已经做过
have been done ，been是be动词的过去分词形式，表示被动
你想，他在外国学习，是被学习吗？不是吧。主动的学习。
所以不用加been.
完毕。

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Reported speech:
Robert is said to have studied abroad,but I don't know what country he studied in.
第一个动词 is said to ...就是完成时 past tense passive ，but i don't know which c.he studied in..也是 pas...

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Reported speech:
Robert is said to have studied abroad,but I don't know what country he studied in.
第一个动词 is said to ...就是完成时 past tense passive ，but i don't know which c.he studied in..也是 past tense,所以用 A ； 其它他的都不会用：
He is said to be studying in France (and he's still there, in France) = they say he is studying in France
He is said to have been studying in France for near five years, and he still has not graduated.
http://www.englishpage.com/verbpage/presentperfect.html
http://www.englishpage.com/verbpage/presentperfectcontinuous.html

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a