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