I think it a great honor to visit your country.A. to invite　B. invitingC. having invited

问题补充：

I think it a great honor to visit your country.

A. to invite

B. inviting

C. having invited

D. to be invited

答案：

A. to invite

B. inviting

C. having invited

(答案→)D. to be invited

解析：考察不定式用法。本句指的不定式to be invited to visit your country是真正的宾语，it是形式宾语。句意：我认为被邀请来参观你们的国家是一件巨大的光荣的事情。故D正确。