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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( ) is a major port of Norway.
A．Oslo
B．Oran
C．San Juan
D．Rouen
单项选择题
Textile business has become more and more difficult ( ) the competition grew.
A．as
B．before
C．since
D．after
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