. He apologized for .
A. his not being able to e
B. his being not able to e
C. his being able not to e
D. him not being able to e
网友回答
(答案→)A. his not being able to e
B. his being not able to e
C. his being able not to e
D. him not being able to e
解析：考查短语： apologize for doing sth 因某事道歉，否定式在doing前面加not，句意：他因他不能来表示道歉。所以选A。