It’s very kind you to help me with my maths. It is hard me to learn it well.A. of; forB. o

问题补充：

It’s very kind you to help me with my maths. It is hard me to learn it well.

A. of; for

B. of; of

C. for; of

D. for; for

答案：

(答案→)A. of; for

B. of; of

C. for; of

D. for; for

解析：这里的of表示所有关系，for表示动作的对象或接受者,意为“给……”、“对…… (而言)”，be kind of sb 就是说某人很友好 固定的搭配。所以选A。