问题补充：
---It is selfless the doctor to devote all the time he had for the patients.
--I think so, they are so great.
A. for; to care
B. of; to care
C. of; to caring
D. for; to caring
答案：
A. for; to care
B. of; to care
(答案→)C. of; to caring
D. for; to caring
解析：句意：医生奉献了所有的时间照顾这些病人，真的是无私。我觉得是的，他们好伟大。It is +adj+for sb +to do sth 对某人来说，做某事是…，本句型中形容词为物性的时候，介词用for，形容词如果是人性的，介词用of，第二空中he had 构成定语从句修饰前面的the time，构成devote sth to doing sth致力于做某事，故选C
