单项选择题

A．on the part of
B．on the basis of
C．on the track of
D．on the verge of
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单项选择题
A．exceptB．except forC．apart fromD．but
A．except
B．except for
C．apart from
D．but
单项选择题
The US border with Canada is the ______ in the world.
A．longest coastal border
B．longest defended border
C．longest undefended border
D．longest undefined border
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