It is very kind you to help me with my work because it is very difficult me to do it by myself.
A. of； for
B. of； of
C. for；of
D. for； for
网友回答
(答案→)A. of； for
B. of； of
C. for；of
D. for； for
解析：根据语境可知此题考查的是重点句型结构中介词的固定用法。It is kind of sb to do sth表示某人做某事真好；it is +形容词+for sb to do sth表示对某人来说做某事怎样，故选A。