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当前学科：肿瘤的治疗
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某肿瘤患者（肿瘤α/β值为10Gy），原计划治疗方案70Gy/35次/7周，由于6次发生给量错误为4Gy/次，如果接下来治疗继续用2Gy/次治疗，完成与原计划相当的疗程需要再照射次数约（）。
A . 20次
B . 10次
C . 15次
D . 12次
E . 25次
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