关于虚拟语气情态动词的问题

It's time that he___ what he should choose as his major
A reconsiders B reconsideredC would reconsider D has reconsidered
为什么选B
--你要掌握虚拟语气的一些特殊结构.如本题的It's (high)time that sb. did sth.[后面动词用过去式]
If I ___have tens of thousands of yuan in future ,I would help my home village build a new school.为什么填should
这也是虚拟语气的固定结构,与将来相反的假设条件从句可用“ 过去式”、“should +动词原形”或“ were to +动词原形”
None was so deaf as those who___hear.
Awon't Bcan't C shouldn'tD may not
为什么填won't
这是一句英语习语,"won't"表示"不愿意"：
None was so deaf as those who won't hear.
不愿意听（别人意见等）的人是最聋的.