问题补充：
Victor apologized for to inform of the change in the plan.
A. his being not able
B. his not being able
C. him not to be able
D. him to be not able
答案：
A. his being not able
(答案→)B. his not being able
C. him not to be able
D. him to be not able
解析：考察动名词的复合结构。本句中横线前面是介词for，说明后面使用动名词doing的形式。动名词的否定式是在doing前面加not,复合结构是在前面加所有格或者宾格。本句中的his not being able to…就是一个动名词的复合结构。仅用于：因为他没有通知计划的改变，Victor向我们道歉。故B正确。
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