问题补充：
Victor apologized for to inform me 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：
apologize for doing sth为做某事而道歉句意：维克多为没有能够通知我计划的改变而向我道歉。be able to 的逻辑主语为his，所以他不能做某事， be able to非谓语动词词组的否定形式是not being able to，故选B
