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一道选择题的疑问Itwasnecessarythattheapplicationformsbackbeforethedeadline.A、mustbesentB、wouldbesentC、besentD、weresent答案是C我知道主句是Itis+adj,从句应该是that+(should)+动词

题目详情
一道选择题的疑问
It was necessary that the application forms_______back before the deadline.
A、must be sent B、would be sent C、be sent D、were sent
答案是C
我知道主句是It is + adj,从句应该是that + (should )+ 动词原形.可是这个句子里面主句里is变成was,后面难道不影响?
▼优质解答
答案和解析
不受影响
所以句型准确来说是it +be+ADJ