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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：高中英語 來源：湖南省期中題 題型：單選題

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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