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题目： 单选题男，72岁。无牙颌，全口义齿戴用10年。临床检查发现义齿人工牙面重度磨耗，口角下垂，口角黏膜糜烂。该患者还可能存在的临床表现是（）。
A鼻唇沟变深
B颏唇沟加深
C面部表情僵硬
D说话时义齿撞击音
E息止
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