单选题:风湿性心瓣膜病二尖瓣狭窄最常出现的早期临床症状是( )

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题目内容:
风湿性心瓣膜病二尖瓣狭窄最常出现的早期临床症状是( ) A.劳力性呼吸困难
B.阵发性夜间呼吸困难
C.急性肺水肿咳粉红色泡沫痰
D.食欲缺乏、肝区疼痛、双下肢水肿
E.胸腔积液、腹水
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