27.It is necessary that everything ____ ready by 6:00 p.m.
问题描述：
27.It is necessary that everything ____ ready by 6:00 p.m.
A.be B.will be C.shall D.would be
选哪个,为什么?
答
A
It is necessary/important/strange/surprising that +主语＋(should)+原型动词.
这是一种虚拟语气句型.