问题补充:
It is very kind you to help me with my lessons because it is very difficult me to learn them 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:考查句型:It is +形容词+介词+sb to do的用法。形容词为形容人的性格品质的词,应用介词of,形容词为difficult,necessary等词时,应用介词for 。所以选A。