Victor apologized for __________ to inform me of the change in the plan.    [ ]

A. his being not able    

B. him not to be able  

C. his not being able    

D. him to be not able

可能使舌苔染白的食物、药物是（）

A.橘子

B.蛋黄

C.牛乳

D.吸烟

E.核黄素