脑筋急转弯Mary and Helen are twins, Mary says,"I have a sister.”But Helen doesn't admit that she hMary and Helen are twins, Mary says,"I have a sister.”But Helen doesn't admit that she has a sister. Why? 请给我个答案
问题描述：
脑筋急转弯Mary and Helen are twins, Mary says,"I have a sister.”But Helen doesn't admit that she h
Mary and Helen are twins, Mary says,"I have a sister.”But Helen doesn't admit that she has a sister. Why? 请给我个答案
答
Helen is a girl and Mary is a boy!