"Robert is said ________ abroad, but I don't know what country he studied in．"
A.tohavestudiedB.tostudyC.tobestudyingD.tohavebeenstudying...
A. to have studied
B. to study
C. to be studying
D. to have been studying 展开
B. to study
C. to be studying
D. to have been studying 展开
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