题目内容
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
A
动词不定式的完成时表示过去发生的事。所提供的情境what country he studied in表明Robert过去曾在某个国家学习过,要填to have studied。

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