It is essential that all the exam papers_back before the end

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It is essential that all the exam papers_back before the end of the term.A.must be sent B.are sent C.will be sent D.be sent 请给出英语解题详情.

首先,这个句子是一个主语从句,it是形式主语,that后面从句是真正主语.在it is adj. that…这种结构中,当形容词是下列词时,that后面的句子谓语动词用虚拟语气：should+动词原型,should可以省略.这样的形容词：appropriate,essential,important,necessary,significant,compulsory,fitting,impossible,obligatory,urgent,crucial,imperative,improper,proper,vital,advisable,desirable,preferable,都是一类有命令、建议、要求含义的形容词再答：因此，这里只能是should be sent，should被省略，选择D
再问：虚拟语气不可以用must+be吗？
再答：嗯，在这种结构里面没有must+动词原型这种用法。在其他类型的一些虚拟语气中，可能会有might+动词原型或者might have done，must不用于虚拟语气。

It is essential that all the exam papers_back before the end It was essential that we sing lease before the end of the mo It was essential that the application forms()back before the It is absolutely essential that all the applicants one by on It is essential that the program _________ into the computer it was essential that the form __back before the deadline.A. And in the end when it`s over all that matters is what you h ___,all of them passed the exam in the end 英语翻译That the parts all fit together properly is an essential It is ( )惊讶that he has passed the exam. It is essential that human____ ways and means to protect the The teacher demanded that the exam _______ before eleven．