IT was required that each student -----enough foog for the public

题目

IT was required that each student -----enough foog for the public
A bring ;B brought; C would bring D had brought 是虚拟语气吗 从哪里可以看出来 还有答案为什么是A

答案

应该是should bring,但是这里的should是可以直接省去的.所以这样看答案就是A了.是虚拟语气.每个学生都被要求要带上足够的食物.required that sb (should) do sth.