In communication, a smile is usually _ strong sign of a friendly and _ open att

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 att

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In communication, a smile is usually _ strong sign of a friendly and _ open att