单项选择题

Something worth doing is none______for being done twice,

A．the worse
B．much worse
C．more worse
D．worse enough
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单项选择题
No instances have been found______an interchanging of these two sentence constructions.
A．for
B．of
C．by
D．in
单项选择题
The usual reason for exemption from tax does not______in this case.
A．apply
B．impose
C．regard
D．demand
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