题目内容
Robert is said abroad, but I don’t know in which country he is.
A. have been studying B. to have been studying C. have studied D. to have studied
B
解析:
be said后应该接不定式形式,而且根据I don’t know in which country he is 意味着他现在仍然在国外学习,表示从过去到现在一直在做某事,要用完成进行体。所以选B,不能选D.
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