问题
选择题
In communication, a smile is usually ________ strong sign of a friendly and ________ open attitude.[ ]
A. the; /
B. a; an
C. a; /
D. the; an
答案
答案：C
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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
答案：C