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Ann is said  ______ research in Africa, and she will come back next month.

A. to do            
B. to be doing          
C. to have done        
D. done

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科目:高中英语 来源:湖南省期中题 题型:单选题

Ann is said _________research in Africa, and she will come back next month.
[     ]

A. to do            
B. to be doing          
C. to have done        
D. done

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