Robert is said to have studied abroad,but i don't know what

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Robert is said to have studied abroad,but i don't know what country he studied in
Robert is said ___ abroad,but i don't know what country he studied in.
A.to have studied B.to study
C.to have been studying
请问这道题目怎么排除BC,C不是强调动作的持续吗?b怎么解释呢,

联系后半段,but i don't know what country he studied in.
选c强调持续的话应改为but i don't know what country he was studying in.
选B的话,时态更加矛盾了,后段意思为我不知道（一般时态表示现在）他在哪个国家学习过.
studied 表示过去发生的事现在已经结束了.

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