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 do据说做…了。又因不定式动作发生在主句动作之前，故应使用完成时，因此C项为正确答案。

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ProfessorJohnsonissaid______somesignificantadvanceinhisresearchinthe