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

C

【解析】考查不定式作主語(yǔ)補(bǔ)足語(yǔ)。Sb be said to do/to be doing/to have done；…to do表示一般性動(dòng)作；to be doing表示動(dòng)作的正在進(jìn)行；to have done表示動(dòng)作的已經(jīng)完成。句意：據(jù)說(shuō)安已經(jīng)在非洲完成了研究，并且她下個(gè)月就回來(lái)了。故選C。

考點(diǎn)：考查不定式作主語(yǔ)補(bǔ)足語(yǔ)

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