单项选择题


A．advantage
B．convenience
C．benefit
D．interest
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单项选择题
A．convincedB．convincingC．being convincedD．having been convinced
A．convinced
B．convincing
C．being convinced
D．having been convinced
单项选择题
A．beingB．beenC．areD．is
A．being
B．been
C．are
D．is
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