A set of numbers has the property that for any number t in the set, t + 2 is in the set. If -1 is in the set, which of the following must also be in the set?

I.-3

II.1

III.5


I only

II only

I and II only

II and III only

I, II, and III

加入错题本 分享
纠错
考题讲解
还没有题目讲解（毕出老师会陆续发布对官方考题的解读，请保持关注）。
求讲解

登录 或 注册 后可以参加讨论

OG2018Q-PS