问题
选择题
. He apologized for _____.
A．his not being able to come
B．his being not able to come
C．his being able not to come
D．him not being able to come
答案
答案：A
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。