It is essential that everyone ___ what to do.A.knowB.knows为什么不是B呢?

问题描述:

It is essential that everyone ___ what to do.
A.know
B.knows
为什么不是B呢?

It is essential /important /strange/vital/ ... that sb (should) do sth 虚拟语气

习惯使然吧!

It is essential /important /natural /strange /possible that +sb do sth 虚拟语气固定句型

这里的其实是一个虚拟语气的句型~省略了should
It is essential ... that sb (should) do sth
希望对你有帮助哦~