After a talk with his mother, the little boy has seen to that the same mistake doesn’t h

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A. one
(答案→)B. it
C. him
D. himself
解析：本题中的it是特殊用法，本题的it北称为模糊it，在句中没有意思，但是不能省略。如I hate it when it is hot。我讨厌天气太热。本句的it和例句的it是同一个用法。See to it that….务必做到…保证…。句义：和妈妈谈话以后，这个小男孩保证同样的错误不再发生。故B正确。