Thanks for inviting me to your party.-.A. Never mind B. Dont say so C. My pleasure

问题补充：

--- Thanks for inviting me to your party.

---.

A. Never mind

B. Don say so

C. My pleasure

D. Yes, please

答案：

A. Never mind

B. Don say so

(答案→)C. My pleasure

D. Yes, please

解析：Never mind没关系，不要记在心上；Don say so不要这样说；My pleasure我很荣幸，别客气；Yes, please是的，请吧。根据上文，谢谢你邀请我参加你的聚会。结合语境可知选C。