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
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单项选择题
______for your help, we' d never have been able to get over the difficulties.
A．Had it not
B．If it were not
C．Had it not been
D．If we had not been
单项选择题
It is strictly______ that access to confidential documents is denied to all but a few.
A．secured
B．forbidden
C．regulated
D．determined
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