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
B、making
C、to have made
D、to make

答案 C

解析 (be said)to have done sth．意为“据说已经……”。本题考查不定式及时态的用法。to have done sth．在该句可以满足(be said)to do sth．的习惯用法，又因为不定式动作发生在主句动作之前，故C符合要求。

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