请问以下句子that引导的是什么从句?能不能帮我分析一下这句的语法要点?
5.Itisessentialthatyourapplicationform___C____________backbeforethedeadline.A.mustbes...
5.It is essential that your application form ___C____________ back before the deadline.
A.must be sent B.would be sent
C.be sent D.will be sent 展开
A.must be sent B.would be sent
C.be sent D.will be sent 展开
2个回答
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