mary was looking forward to ——to kate`s birthday party a.inviting b.being invited c.invite d.be invited

mary was looking forward to ——to kate`s birthday party a.inviting b.being invited c.invite d.be invited
mary was looking forward to ——to kate`s birthday party a.inviting b.being invited c.invite d.be invited

mary was looking forward to ——to kate`s birthday party a.inviting b.being invited c.invite d.be invited
选D
1,look forward to do sth 表示期待做某事,要用动词原形
2,mary是被邀请,所以用被动语态