It was essential that the application forms()back before the dealine A.be sent B.were sent

问题描述:

It was essential that the application forms()back before the dealine A.be sent B.were sent
这A与B语法上有什么不同了?

本题应选 A.
在句型“It be + adj.+ that - clause"中,that - clause 部分应用 “ should + 动词原形” 的虚拟语气,should 也可以省略.
本题就是考查的这一知识点.只不过从句用了被动语态,且省略了should.补全应为:should be sent
句意:非常重要的是申请表应在截止日期之前送回.