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。
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