Its my great honor to give a speech at the opening ceremony.A. to inviteB. invitingC. ha

问题补充：

Its my great honor to give a speech at the opening ceremony.

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：本题主要考查对形式主语用法的掌握。本句中的it是形式主语，因此要用动词不定式做真实主语，又因为这里是“被邀请”而感到荣幸，因此要用被动语态，故答案选D。