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【单选题】
男，65岁。间断上腹痛、腹胀25年，10年前经胃镜检查诊断为“慢性萎缩性胃炎伴肠化生”。3个月来上腹痛加重，影响睡眠，并有间断呕吐，黑便，体重下降8kg。最可能的诊断是A.
慢性胃炎急性发作
B.
胃癌
C.
十二指肠溃疡并幽门梗阻
D.
胃淋巴瘤
E.
胃息肉
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