单项选择题

You______ engage in serious debate or discussion unless you are willing to endure attacks.

A．have better not
B．had better not
C．have better not to
D．had better not to
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单项选择题
This video may be freely reproduced _______ commercial promotion or sale.
A．as for
B．except for
C．thanks to
D．up to
单项选择题
He added that the state government has made _______ arrangements for the conference.
A．accurate
B．absolute
C．adequate
D．active
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