The CDs are on sale Buy one and you get _____ completely free .A._英语解答

The CDs are on sale Buy one and you get _____ completely free .
A.otherB.one选什么?为什么?

人气：119 ℃　时间：2020-09-07 21:59:40

解答

只有AB两个选项吗?
买一个,其他的免费.
假如有another 的话选another,意思是买一送一.