Spensor made an apology for --------to inform me of the change in plan . A .his being not ableB . him not to be able   C .his  not being able   D him  to be  not  able .应选那个?为什么?

问题描述:

Spensor made an apology for --------to inform me of the change in plan . A .his being not able
B . him not to be able   C .his  not being able   D him  to be  not  able .应选那个?为什么?