I felt it a great honour to speak to you.A. to askB. askingC. to be askedD. having asked

问题补充：

I felt it a great honour to speak to you.

A. to ask

B. asking

C. to be asked

D. having asked

答案：

A. to ask

B. asking

(答案→)C. to be asked

D. having asked

解析：句中的 it 为形式主语，不定式 to be asked to speak to you 为真正主语，因“我”与ask为被动关系，故用被动式。