--iwon'tgotonewyorkwithyou.it'stoocoldthere.--changeyourmind,givemeacall.a.mightyoub.shouldyouc.mustyoud.wouldyou答案为什么是b,求详解.

Question

--i won't go to new york with you.it's too cold there.
--______change your mind,give me a call.
a.might you b.should you
c.must you d.would you
答案为什么是b,求详解.

Answer 1

If引导的虚拟语气分三种：与过去事实相反,与现在事实相反,对将来的假设.这里是第三种.句式为：从句：should do或were to do或do；主句：一般过去时(祈使句除外).当从句用should do时,可以倒装.
也就是说,B项本来是：If you should change your mind,.倒装后成为：Should you change your mind.其它选项都不是虚拟语气.