Robert is said abroad but I don’t know what country he studied in .A. to have studiedB.

问题补充：

Robert is said abroad, but I don’t know what country he studied in .

A. to have studied

B. to be studying

C. to study

D. to have been studying

答案：

(答案→)A. to have studied

B. to be studying

C. to study

D. to have been studying

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