题目内容：

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,

优质解答

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...