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Robert is said   abroad, but I don’t know what country he studied in.
A.to have studiedB.to study
C.to be studyingD.to have been studying
答案:A
试题分析: 考查动词的不定式;因为上下文的Robert is said _______abroad,和but don’t know what country…都指“现在”,那么,下文的What country he studied in中的studied又说明动作是过去发生,其结果在现在,现在没有“正在进行”,故而现在完成进行时态的A.to have been studying
考点 : 考查动词的不定式