this is a friend of my father's 可以将a改成one吗?书上说不可以改，但没有为什么，

is friend a his of photo this 连词成句 is friend a his of photo this 怎么重新排列 this.is a p__ of my friend jean the boy's name=the name of the boy this is my friend =this is a friend of mine 看看“of”后!为什么 12.This post card is sent by .12.This post card is sent by .A.a friend of father B.a friend of my father’s C.my father friend D.my father friend’s This is a nice doll ____ your friend .A.with B.of C.for D.to This is a friend of-----.A.you B.his C.my D.her （）This is a friend of ____.A.his B.him C.her D.her's This is a piece of paper.You can send your friend a ____________. This is a friend of _____ .A.he B.him C.his为什么,说出原因. This boy is a friend of ______(I).用所给单词的适当形式填空. this is an url probe to a friend of mine 翻译成汉语好想知道啊~~! a friend in word is never a friend of Peter's girl friend is really out of this world. This is a photo of her family.改为同义词. Emma is my good friend .变成一般疑问句英语问题 this is my friend ...is a friend of +名词?名词所有格? Tom is a best friend of mine.