It's my great honor to give a speech at the opening ceremony.
A. to invite
B. inviting
C. having invited
D. to be invited
网友回答
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。