Professor Johnson is said__________some significant advance in his research in t

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问题 Professor Johnson is said__________some significant advance in his research in the past year.

选项 A、having made
B、making
C、to have made
D、to make

答案 C

解析语法结构。由于Professor Johnson去年的研究取得重大进展先于“据说”之前，故应用不定式完成式。故D不对。be said to do/have done/be为常用结构。

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