Which girl(one) is your sister's friend?写one是因为提问者并不知道她姐姐(妹妹)的朋友是何性别,所以要用one。这个句子应该挺简单的,稍稍想一下就会了。呵呵!~~
which girl is your sister's friend?(哪个女生是你姐姐的朋友?有着大眼睛的女生是我姐姐的朋友)愿采纳,谢谢
Which girl is your sister's friend?