Professor Johnson is said ------some significant advance in his research in the past year. ( )A having made B making C to have made D to make 请说明详细原因,谢谢!
问题描述：
Professor Johnson is said ------some significant advance in his research in the past year. ( )
A having made
B making
C to have made
D to make
请说明详细原因,谢谢!
答
C
此处使用不定式作非谓语动词,因为主句的位于是said而且时间是in the past year所以应该用现在完成时.