【題目】 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】C

【解析】考查不定式作主語補足語。Sb be said to do/to be doing/to have done；…to do表示一般性動作；to be doing表示動作的正在進行；to have done表示動作的已經(jīng)完成。句意：據(jù)說安已經(jīng)在非洲完成了研究，并且她下個月就回來了。故選C。

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