单项选择题

A．at
B．in
C．of
D．by
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单项选择题
A．insist onB．work onC．count onD．depend on
A．insist on
B．work on
C．count on
D．depend on
单项选择题
A．HoweverB．ThereforeC．In additionD．Consequently
A．However
B．Therefore
C．In addition
D．Consequently
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