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

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问题 Robert is said_________abroad, but I don’t know what country he studied in.

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

答案A

解析考查非谓语动词。句意：据说他曾到国外留过学，但是我不知道是在哪个国家留学。由studied可知“留学”这个动作已结束并发生在谓语动作is said之前，所以要用完成式，故选A。

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