Some hobbies are very expensive,but others don't cost anything______

问题描述:

Some hobbies are very expensive,but others don't cost anything______
A.first of all
B.ar all
C.of all kinds
D.in all
请问应选哪个?为什么?请分析详细一些.

应该是B,at all吧
at all
adv.
根本(一般用在否定句,疑问句)
“一些爱好要花费很多资金,而其他的则根本不花钱”