吴先生,20岁,反复上腹疼痛,夜间明显,伴反酸喜按2个月,2日来大便呈黑色,体检:血压140/80mmHg,腹软,右上腹压痛,无反跳痛,肝脾未及,最可能的病因诊断是( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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