填空题

It was essential that the application forms should (send) ______ back before the deadline.

【参考答案】

be sent
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填空题
We (say) ______ enough on how to learn a foreign language.
单项选择题
A．At a library.B．At an office.C．At a bookstore.D．At a classroom.
A．At a library.
B．At an office.
C．At a bookstore.
D．At a classroom.
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