Question

it is selfless()the doctor to devote all the time he had ()for the patients.

答案是of ,to caring为什么

Answer 1

it is +adj of sb to do sth....是固定搭配，意思是“做某事对于某人来说怎么怎么样”

比如 it is kind of you to help me! 你帮助我，你人真好。

后面用了caring 是因为 devote time to doing sth 固定词组 意思是“投入时间做某事”

所以这句话可以翻译为 “这位医生把他所有的时间投入到病人身上真是无私啊！”

Answer 2

it is +adj of sb to do sth....
had to的中文意思是不得不
caring 因为devote all the time doing sth