单项选择题

It is essential that these application forms ______ back as early as possible.

A．must be sent
B．will be sent
C．are sent
D．be sent
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单项选择题
Millions of workers were on the streets in the greatest______ of working class solidarity this country has ever seen.
A．demonstration
B．explanation
C．presentation
D．communication
单项选择题
It is human nature to think back to Golden Age______ one’’ s country was strong and respected.
A．when
B．provided
C．as
D．unless
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