问题补充：
Mike apologized for to inform her of the change in the working plan.
A. his being not able
B. him not to be able
C. his not being able
D. him to be not able
答案：
A. his being not able
B. him not to be able
(答案→)C. his not being able
D. him to be not able
解析：句意：Mike为没能告知她工作计划的改变而道歉。介词for后用动词的-ing形式，其否定形式是在前面加not，其所有格形式是在前面加his…。由句意可知选C。
考点: 考查习惯句型的用法。
