I am having a great time _____ camp.A.at B.in C.on

I am having a great time _____ camp.
A.at B.in C.on

选C,on camp表示露营,野营之类的意思
have a great time on sth 干某事玩得愉快,过的高兴
have a great time on camp 野营过的很愉快

选C，on camp表示露营，野营之类的意思

选C，
have a great time on sth 干某事玩得愉快，过的高兴
have a great time on camp 野营过的很愉快

c

on