Professor Johnson is said______some significant advance in his research in the p

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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

解析非限定动词题。It is said to do表示“据说做了……”，不定式的完成式to have done表示不定式的动作先于谓语动词前完成，而本句中的“去年的研究取得重大进展”先于“据说”，因此to have made为本题的正确答案。

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