单项选择题

Smoking does great harm to our health.（）is smoking allowed in public places.

A．In no time
B．At a time
C．At all times
D．At no time

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单项选择题
I don't want to imply that every point in this contract（） negotiable.

A．are
B．is
C．being
D．been
单项选择题
We （）some usual international practices.

A．have adopted
B．adopt
C．adopted
D．have been adopted
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