（）tomorrow,we would have to put off the sports meetA Were it rain B should it rain 为什么选B
问题描述：
（）tomorrow,we would have to put off the sports meet
A Were it rain B should it rain 为什么选B
答
b
这句为关于将来的虚拟语气：if it should rain tomorrow,倒装为should it rain
答
Should ir rain= mean the same as if it rains
答
因为后面有WOULD,为使前后一致,用委婉气SHOULD
答
这是个将来完成时，也可看成是虚拟语气，用should
答
这里是虚拟语气,如果明天下雨,与将来的事实（将来不下雨）相反,从句,应用动词过去式/should+ 动词原形/were to + 动词原形；而主句则应该这样,would/should/could/might+动词原形
而Should it rain tomorrow在句中是从句,若要用be动词,应该是were it to rain.