题文
In communication, a smile is usually _____ strong sign of a friendly and _____ open attitude.
| A．a; / | B．the; / |
| C．a; an | D．the; an |
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In communication, a smile is usually _____ strong sign of a friendly and _____ open attitude.
| A．a; / | B．the; / |
| C．a; an | D．the; an |
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