英语单选题It was essential that the application forms ( ) back be

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英语单选题
It was essential that the application forms ( ) back before the dealine.
A:must be sent B:would be sent C:be sent D:were sent
可不可以选A?请问你的答案是什么,说明并分析原因.

很高兴为你解答.

保证正确率~!

正确答案是：C

【解析】：
It was essential that the application forms 【 (should ) be sent】back before the dealine.
申请表在截止日期前被送回是必要的.

It is essential that sb should do 做...是基本的、必要的,should 可以省略.
这里是虚拟语气,省略了 should.
类似的形容词还有：strange ,necessary ,natural 等等.

祝开心~!

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