问题
单项选择题
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
答案
参考答案：B
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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
参考答案：B