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Robertissaidabroad,butidon‘tknowwhatcountryhestudiedin.A.tohavestudiedB.tostudyC.tobestudyingD.tohavebeenstudying为什么不能选d?

题目详情
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
为什么不能选d?
▼优质解答
答案和解析
have been studying abroad 表示已出国学习,并将继续学习,后面有个错误,which country.
从后半句的studied能看出,出国留学已结束,我不知道他曾在哪个国家留学.所以是to have studied.听说罗伯特出国留过学,但是我不知道是哪个国家.