[单选题]It is essential that these application forms（）back as early as possible.

must be sent

are sent

will be sent

be sent

正确答案：D

题目解析

本题考查虚拟语气。
句意：这些申请表必须尽早寄回。
由题干可知是主语从句It is essential that 结构，后面通常要用虚拟语气，谓语动词使用should（should可以省略）+动词原形。故D选项符合题意。

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[单选题]It is essential that these application forms（ ）back as early as possible.