单项选择题
患者，女，45岁，诊断为特发性血小板减少性紫癜，正规泼尼松治疗1年后，血小板20×109／L，但仍在维持服用泼尼松30mg／d治疗。
应进一步选择的治疗方法是（）
A．泼尼松加量
B．脾切除
C．服用叶酸
D．预防性输血小板
E．骨髓移植
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