单项选择题

A．replace
B．purchase
C．supplement
D．dispose
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单项选择题
A．only ifB．much asC．long beforeD．ever since
A．only if
B．much as
C．long before
D．ever since
单项选择题
A．vesselsB．routesC．pathsD．channels
A．vessels
B．routes
C．paths
D．channels
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