an old friend of ____ is an engineer.

题目

an old friend of ____ is an engineer.
答案是me,i,my,mine,主要是这句话到底怎样看、is an engineer an old friend of 为什么不是这样排呢,an old friend of ____ is an engineer而是这样排法.
很多句子我都不懂排法、弄不明白.

答案

答案是mine；
这句话的意思就是说：我的一个老朋友是工程师.
an old friend of mine 这是主语,is是谓语动词,an engineer.是宾语.
an old friend of mine 等价于 one of my old friend.因为是在副词of后面,所以要用mine