I think it was a great honor for me to speak to the public.A. to inviteB. to be invitedC.

问题补充：

I think it was a great honor for me to speak to the public.

A. to invite

B. to be invited

C. inviting

D. having invited

答案：

A. to invite

(答案→)B. to be invited

C. inviting

D. having invited

解析：考查不定式的用法：固定句型是it’s a great honour for sb to do sth对某人来说做…是很荣幸的，it是形式主语，不定式是真正的主语，我是被邀请的 所以排除A C 句意：很荣幸我能被邀请来这里给公众做演讲。选B。