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患者，女性，24岁，贫血1年。血红蛋白78g/L，红细胞3×10
12
/L，网织红细胞0.006，白细胞、血小板正常。经口服铁剂治疗7天后，血红蛋白不升，网织红细胞升为0.014，最可能的诊断是（）
A . 溶血性贫血
B . 再生障碍性贫血
C . 巨幼细胞贫血
D . 缺铁性贫血
E . 脾功能亢进
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