It’s very nice of you to help me find th e key A.of B.for C.to D.on选哪一个,请赐教!

It,s very nice of you,中文, It's very nice of you It's very nice! it's very nice of you同义句 It's very nice of you 的中文 英语 it's very nice of you的回答 It's very nice of you 改为同义句 it's very nice of you ----(say) so ( )oh,it's very nice It's very nice ( )you. it's very nice of you.同意句 以 it‘s very ____ ____you.填写 It's very nice.It's yellow. It's very nice of you to write to me,为什么用of It's very nice是什么意义 It's very nice ___you to write____me What______this one?------------It;s very nice. it's very nice of you在什么场合下用 It's very nice of you to give me the chance.