单项选择题

A．except
B．except for
C．apart from
D．but
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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
单项选择题
A．yawlingB．yawningC．yawingD．yawping,
A．yawling
B．yawning
C．yawing
D．yawping,
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