老师你好,请问 a 9-year-old boy 如果去掉 不定冠词,这个短语怎样表示、

老师你好,请问 a 9-year-old boy 如果去掉 不定冠词,这个短语怎样表示、 请问 有谁知道 a 15-year-old boy 的同义短语 请问:是a four years old boy?还是a four year old boy?正确 he is a 13-year-old boy a thirteen-year-old boy=什么? a thirteen-year-old boy的中文翻译 _____(a/an)1-year-old boy _____(a/an)8-year-old boy _____(a/ a five-year-old boy还是a five-year old boy a four-year-old boy可以说成a four-year old boy fifteen-year-olds和a fifteen-year-old boy an 【】-year-old boy a 11-year-old boy还是an 11-year-old boy