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In communication, a smile is usually __________ strong sign of a friendly and _______ open attitude.
A．the; /B．a(chǎn); anC．a(chǎn); /D．the; an
C
考查冠詞的用法。句意為“在相互交流中，微笑通常是一種友好和開放的態(tài)度的明顯特征�！盿 用在可數(shù)名詞sign前，泛指一類事物；friendly and open 是并列，修飾attitude。
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