an old friend of my sister's always helps my brother and ___

an old friend of my sister's always helps my brother and ___ -An old friend of my sister's always helps my brother and___ Jack is a friend of ___ A.my B.my brother C.my brother's D.m My friend's sister's only one year old.译英, they,your friend,my sister,my sister and brother,we,your是不是第 1.___ my way to school,I met with an old friend of mine.A.At a friend of my brother和a friend of my brother's 有什么区别? He is a friend of my brother's.和He is a friend of my brother my brother's sister is my(s ). one of my sister's friend 后用加S吗 Jimmy is a friend of _______(my brother)是添my brother's 还是my a friend of my brother