请说明为什么.Robert is said _____ a broad ,but i do not know what

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请说明为什么.
Robert is said _____ a broad ,but i do not know what country he study in
A,to have study B,to study C,to be study D,to have

答案是B
据说据说罗伯特出国留学,但是我不知道他在哪个国家学习.
A.据说罗伯特曾经留学,但由后面的“我不知道他在哪个国家学习.那个study是现在时,所以前面不能用现在完成时态!
C,是被动语态,不对
D、完全不对.

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