英语it's very good( )you( )meA for,to helpB of,to helpC for,helpingD of,helping求原因

英语it's very good( )you( )meA for,to helpB of,to helpC for,helpingD of,helping求原因
英语it's very good( )you( )me
A for,to help
B of,to help
C for,helping
D of,helping
求原因

英语it's very good( )you( )meA for,to helpB of,to helpC for,helpingD of,helping求原因
选B,这是个固定结构 It's adj.of/for sb.to do.
good是形容人好,形容人的介词用of,
to do 是真正主语.
同样的例子还有：It's very kind of you to do so.

C，固定用法

B固定用法

b因为to help me 不定式表示真正的主语而is good of =is kind of

选B ，It's +形容词+of sb + to do sth 形容人的品质
It's +形容词+for sb + to do sth 形容事情