an eleven year old 和 an eleven-year-old

an eleven year old 和 an eleven-year-old 请问是an eleven-year-old boy还是an eleven-year old Maomao is an eleven-year old boy.的意思 为什么用an eleven-year-old boy?eleven开头发音不是辅音吗? 帮忙做道英语阅读题An old postcard changed the lives of an eleven-year Bob is (a) eleven-year-old boy.为什么用a不用an? 英语翻译Do you know me?Hello!I am an eleven-year-old girl.My nam 英语翻译An eleven-year-old boy in a small town wanted to be a tr I am eleven year old.（改错） an 【】-year-old boy Linda is an eleven-years-old girl. She is an eleven year old student.(不改变句意啊）根据这句句子改：The___stud