英语语法求救The post card is sent by____A, a friend of my father B

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英语语法求救
The post card is sent by____
A, a friend of my father B, a friend of my father 's
有例句：
He is a friend of my father. 是父亲朋友
He a friend of my father 's 众多的一个
根据这个例句那么本体该如何解释好?
为什么A不能选?
求高手详细分析

a friend of my father's = a friend of my father's friends = one of my father's friends
解释：此题不好解释,只能说是英语表达习惯：
1）a/an + 可数名词单数 + of + 名词性物主代词/名词所有格形式 = one of + 形容词性物主代词/名词所有格形式 + 可数名词复数.
此短语可以类推为：基数词 + 可数名词 + of + 名词性物主代词/名词所有格形式 = 基数词 + of + 形容词性物主代词/名词所有格形式 + 可数名词复数.
2）再如：two friends of mine = two of my friends
three friends of Li Lei's = three of Li Lei's friends
此类一般不使用A那种结构.
3）此处对名词所有格形式再做进一步解释：名词所有格形式有两种使用方式,一是等同于形容词性物主代词,二是等同于名词性物主代词.
如：This book is Li Lei's（名词性物主代词）. = This is Li Lei's（形容词性物主代词） book.
whose也同上述用法：Whose（名词性物主代词） is this book? = Whose（形容词性物主代词） book is this?

英语语法求救The post card is sent by ____A,a friend of my father B 英语翻译33.This post cardis sent bt_B___.A.a friend of my father ( ) 3 The post card is sent by ____. "i will sent a letter to my friend at the post office"对my fr 12.This post card is sent by . 从A、B、C、D中选择一个最佳答案.This post card is sent by __________ .3Q This letter was sent by a friend of my father's. he is a good friend of of my father's ( )The man ____ the bike is a friend of my father's The ( )a( )( )card is my card. The instrument is being repaired by a friend of my father's. the instrument is being repaired by a friend of my father's