单项选择题


A．that
B．what
C．which
D．it
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单项选择题
A．informB．convinceC．claimD．refute
A．inform
B．convince
C．claim
D．refute
单项选择题
A．AlthoughB．ThoughC．HoweverD．In addition
A．Although
B．Though
C．However
D．In addition
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