Robert is said___abroad,but I don't know what country he stu

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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.
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.

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