He apologized for able to inform me of the change about the plan in advance.A. his being n

问题补充：

He apologized for able to inform me of the change about the plan in advance.

A. his being not

B. his not being

C. him not to

D. him to be not

答案：

A. his being not

(答案→)B. his not being

C. him not to

D. him to be not

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