单选题：Constantsmilingwithoutapparentreasons（　　）.

题目分类：成人英语三级
题目类型：单选题
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题目内容：

Constantsmilingwithoutapparentreasons（　　）. A．isasignofone'sfriendliness
B．isasignofone'sunfriendliness
C．makespeoplefellhappy
D．makespeoplefeeluncomfortable

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