— Would you like to go to the concert with me tonight?
— I'd love to, I can't. I have a lot of homework to do.
A:or
B:and
C:but
1984年奥运会上,中国收获了15枚金牌8枚银牌9枚铜牌的成绩,请问中国一共收获了多少枚奖牌?