单项选择题

It is essential that your application form______back before the deadline.

A．be sent
B．sent
C．send
D．must be sent
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单项选择题
We all write______, even when there's not much to say.
A．by and by
B．step by step
C．now and then
D．more or less
单项选择题
The workers have never stopped their struggle______unfair treatment．
A．against
B．for
C．from
D．to
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