单项选择题

I ______with thanks the help of my colleagues in the preparation of this new column.

A．express
B．confess
C．verify
D．acknowledge
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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
______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
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