-Don’t worry. I will help you.---Thank you. It’s very kind you to say so.A. forB.

问题补充：

---- Don’t worry. I will help you.

-----Thank you. It’s very kind you to say so.

A. for

B. on

C. to

D. of

答案：

A. for

B. on

C. to

(答案→)D. of

解析：D 考查It is +adj. +of/ for sb. to do sth.句型。指人的品质的形容词用of，其余用for。kind“友好的”，指人，故选D。