单项选择题

( ) is a major port of Norway.

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