问题补充：
It’s very kind you to help me with my lessons. It is hard me to learn them well .
A. of, for
B. of, of
C. for, of
D. for, for
答案：
A. of, for
B. of, of
C. for, of
D. for, for
解析：It‘s adj of sb to do sth，表示对于某人评价的，It’s adj for sb to do
sth，表示对于某人而言，做某事是怎样的，故选答案为A
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