题目内容：

there's plenty of time for you to think about it carefully,so you needn't ___rush now ___should you change your mind ,I wouldn't mind
A can't would
B shouldn't could
C needn't should
D won't ；might
答案是C'谁知道为什么'

优质解答

needn't 没必要
后空表示与【将来情况相反】的虚拟语气.
Should you change your mind=if you should change your mind假如你现在改变主意

追问：

怎么看出来是与将来事实相反？

追答：

根据语境：有很多时间供你为此仔细考虑，所以你没必要匆匆忙忙。【假如你要改变主意，我不会介意】。

追答：

祝你进步！