Professor Johnson is said______ some significant advance in his research in the

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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 be said to…为习惯用法，表示“据说……”，且句中说“研究取得进展”是在“据说”前发生的事实，所以要用不定式的完成式。故C项正确。

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