◎ 题干
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

◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“Ann is said _________research in Africa, and she will come back next month.[ ]A. to doB. to be doingC. to have doneD. done…”主要考查了你对  【不定式的进行式】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。