The CDs are on sale Buy one and you get _____ completely free .为什么添 one
问题描述：
The CDs are on sale Buy one and you get _____ completely free .为什么添 one
选项 A other B others C one D ones 正确答案是C 为什么啊` 我哭……
答
买一赠一啊
one=one CD