大学英语四级语法一题（52）It was essential that the application forms ___ back before the deadline.A must be sent B be sent C would be sent D were sent

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大学英语四级语法一题（52）It was essential that the application forms ___ back before the deadline.A must be sent B be sent C would be sent D were sent
大学英语四级语法一题（52）
It was essential that the application forms ___ back before the deadline.
A must be sent B be sent C would be sent D were sent

大学英语四级语法一题（52）It was essential that the application forms ___ back before the deadline.A must be sent B be sent C would be sent D were sent
B
It is adj.that sth.(should)do sth.是固定句型
should可以省略,但必须用动词原形

你好！答案是B. be sent
完整的句子是：
It was essential that the application forms (should) be sent back before the deadline.
这个句型是：It is ... that ... (should) 动词原形
希望对你有启发。

答案应为B。这是一个虚拟结构的句式,应该是should be done.此处省略了should.句意为：重要的是申请表格应该在截止日期前寄回来或送回来。

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