Robert is said ______abroad, but ! don’t know what country he studied in.

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问题 Robert is said ______abroad, but ! don’t know what country he studied in.

选项 A、to have studied
B、to stay
C、to be studying
D、to have been studying

答案A

解析 根据studied可确定Robert过去在国外学习,  因此应用不定式的完成式。
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