It’s very kind you to help me with my English．
一Not at a11．I think it is important us to help each other．
A. of，of
B. for，of
C. of，for
D. for，for
网友回答
A. of，of
B. for，of
(答案→)C. of，for
D. for，for
解析：for 有为了……的意思，多表示目的对象等。of ……的，多用来说明后接词语的性质属性等关系。根据题意，它对我们来说很重要，选C。