it is nice of you to help me的最佳口语回答句是A thank you,B you do not say so,C my pleasure

it is nice of you to answer it It is nice of you to do that. it is nice to have you here,it is nice of have you here 这两句语法正确吗?为什么 It's nice of you to say It's nice of you to help it is nice to have you It is nice to be with you It is very nice of you to help me 为什么要用of It is very nice of you to help me 为什么要用of It is very nice ___ you to write to me.A.of B.on C.for It is nice of 连词成句show,way,it,is,to,the,nice,you,me,of It is very nice ( )you A of B for C at D to It is very nice of you后接to do 还是doing? 怎么回答 ------It is nice of you to help me.----________ It is very kind of you to help me nice中文好评 It is (really) nice of you to say so.为什么括号内要填really? It is ______(luck)of you to have such a nice flat.