In communication，a smile is usually ________ strong sign of a friendly and ________ open attitude. (2011·重庆，26)
| 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. (2011·重庆，26)
| A．the；/ | B．a；an |
| C．a；/ | D．the；an |
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