you I owe a thousand apologies having doubted your ability.
A. For; to
B. For; for
C. To; to
D. To; for
网友回答
A. For; to
B. For; for
C. To; to
(答案→)D. To; for
解析：句意：我曾怀疑过你的能力，真是万分抱歉。本句的结构是：owe sb. sth. for doing sth. 或owe sth. to do. for doing sth.。故选D。