题文
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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