did a boy friend of my sister's go to the party?这句有错吗

did a boy friend of my sister's go to the party?这句有错吗 i have a boy friend 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 Friend of a Friend 歌词 The boy ______the blue shorts is my good friend.A.onB.in C.of D.over 连词成句.1.yours,is,under,a,boy,the,the,of,friend,tree(?) This boy is a friend of ______(I).用所给单词的适当形式填空. With whom did you watch 2010 World Cup Opening Ceremony ( )A.A friend of mine B.A friend of meC.A friend of my sister D.A friend of you为什么要解释 Bob looked out of the window.There___he had never seen before.A.a boy did stand B.a boy stoodC.did a boy standD.stood a boy求详解 boy friend boy friend , 34.Look at the boy under the tree.He is ________.A.Andy sister's friend B.one of Andy's friend 34.Look at the boy under the tree.He is ________.A.Andy sister's friend B.one of Andy's friend C.a friend of Andy's D.Andy's a friend I WONT HAVE A BOY FRIEND是什么意思 a friend of mine. a friend of Is ___your pen friend?A.a boy B.a girl C.the boy D.a friend The boy over there is a good friend of( ) A his B your C my D our -Why did they help Mrs.Brown with her work?-Because she was_______A.an old friend of them B.a good friend of theirsC.one of their of themD.the friend of them求理由,