Robert is said abroad, but I don’t know...
Robertissaidabroad,butIdon’tknowinwhichcountryheis.A．havebeenstudyingB．tohavebeenstud...
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
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| B |
| 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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