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In communication, a smile is usually __________ strong sign of a friendly and _______ open attitude.
A.the; /B.a; anC.a; /D.the; an
C
考查冠词的用法。句意为“在相互交流中,微笑通常是一种友好和开放的态度的明显特征。”a 用在可数名词sign前,泛指一类事物;friendly and open 是并列,修饰attitude。
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