像an eight-year-old girl之类要加old,那an eight hundred-word article为什么不用加long呢说成an eight hundred-word-long article可不可以呢,还有a two-week vacation可不可以说a two-week-long vacation 和two weeks‘ vacation说法

是a eight-year-old 还是an eight-year-old he is ____boy 1.a eight-year-old 2.an eight-year-old 3.an eight-years-old 4.a eight year old Mary is girl,but she knows a lot about science.A.a eight-year-old B.eight-year-old C.eight years old D.an eight-year-old an eight-year-old一定要加an吗? an eight-year-old child与an eight years old child 的区别 Benny is an eight-year-old boy 相同的句子 It is an eight- year-old child改为同义句 eight years old与eight- year-old He is __,and he has__sister.A.ten years old,an eight-year-old B.ten-year-old,eight year old she is an eight years old 还是she is an eight-year-old girl对要原因啊 he is ______boy A.an eight years old B .an eight-year-old两个好像都行啊,奥不懂啊 __(a) eight-year-old she has _daughter_NancyShe has _____daughter _____Nancy A.a eight yers old ,name B.an eight-years-old,named C.an eight-year-old,named D.a eight-ear-old,naming 像an eight-year-old girl之类要加old,那an eight hundred-word article为什么不用加long呢说成an eight hundred-word-long article可不可以呢,还有a two-week vacation可不可以说a two-week-long vacation 和two weeks‘ vacation说法 eight -year old 与 eight years old的区别 Have you heard the news?An ____ boy was hurt in tje traffic accident.A.eight-years-old B.eight years old C.eight-year-old D.eight-years old说明原因 She is an eight-year-old girl.=she is a girl__________ ____________. Jim is _____(a/an)eight ——year——old boy.