单项选择题

Shenzhen has passed a new bill to ban smoking in public places, which can ______ the civilization of a city.

A．weigh
B．balance
C．explore
D．measure
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单项选择题
—You didn t attend the party last night—No, I ______, for the party was put off for some reason.
A．couldn"t have
B．needn"t have
C．didn"t need to
D．don"t have to
单项选择题
Children may get into some bad habits ______ they lack self-discipline.
A．when
B．unless
C．though
D．until
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