单项选择题

____________ everything means to know nothing.

A．To know
B．Knowing
C．One knows
D．You know
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单项选择题
It's no use ____________ with him. He won't change his decision.
A．arguing
B．to argue
C．to be arguing
D．if you argue
单项选择题
There must be ____________ reason for what he has done.
A．some
B．any
C．one
D．one useful
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