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!
人气：304 ℃ 时间：2020-06-02 18:43:33
解答
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.
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