问题
选择题
It is very kind _____ you to help me with my lessons. It is difficult _____me to learn them well.
A．of , of
B． for , of
C．of , for
D．for , for
答案
答案：C
考查固定句型。It is +adj. of/for sb. to do sth.当形容词是指人时，用介词of；指物时用介词for。Kind“友好的”，指人，故用of；排除B、D；difficult“困难的”，指事情，用for。故选C。