(单选题)8: 环磷酰胺体外没有活性,在体内经代谢而活化。在肿瘤组织中所生成的具有烷化作用的代谢产物是
A: 4-羟基环磷酰胺
B: 4-酮基环磷酰胺
C: 羧基磷酰胺
D: 醛基磷酰胺
E: 磷酰氮芥、丙烯醛、去甲氮芥
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