The CDs are on sale!Buy one and you get completely free.ks5u ks5u

问题描述:

The CDs are on sale!Buy one and you get completely free.ks5u ks5u
A.other B.others C.one D.ones ks5u ks5u
为什么是C啊?
这是固定搭配?A为什么不对?虽然怀疑要用the other,但是……

buy one and get one free 意思就是买一送一