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