In communication, a smile is usually __________ strong sign of a friendly and _______ open attitude....
2023-01-23 01:55:10 31次 2012届山东省枣庄市高三九月月考英语题（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
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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