单项选择题

A．inform
B．convince
C．claim
D．refute
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单项选择题
A．HoweverB．In additionC．By contrastD．Therefore
A．However
B．In addition
C．By contrast
D．Therefore
单项选择题
A．anniversaryB．eachC．annualD．every
A．anniversary
B．each
C．annual
D．every
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