an eleven year old 和 an eleven-year-old用哪个?为什么

an eleven year old 和 an eleven-year-old用哪个?为什么 a eleven-year-old还是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? 当an eleven-year-old girl中eleven是数字11时用a还是an当an eleven-year-old girl中eleven是数字11时前面用a还是an She is an eleven year old student.(不改变句意啊）根据这句句子改：The___student is eleven ___old. Bob is (a) eleven-year-old boy.为什么用a不用an? I am eleven year old.（改错） Don’t complain to him.You know he is _____ boy.A.a three-years-old B.an eleven years oldC.an eleven-year-old D.only three year old 为啥? I am eleven years old this year.怎么翻译? an 80 years old woman和an 80-year-old woman Lily is eleven years old this year.用next year 替换this year改写句子 Don’t talk to Alicia like that.She is only _____ eleven-year-old kid.A./ B.a C.the D.An don't talk to simon like that .heis only 【】eleven-year-old boyA.a B.an C.the D.不填为什么这么选翻译thanks eleven-year-olds跟eleven-year-old的音标分别是什么?谢eleven-year-olds跟eleven-year-old这是我在英语书上看到的,烦请哪位知情人士告知音标. Linda is an eleven-years-old girl.改错.是不是该改为：Linda is an eleven-years-old’s girl. I am eleven years old ths year.的同义句__ __ __eleven this year.