Li Lida a____boy crossed the Qiongzhou Channel in June 2000.
Li Lida a____boy crossed the Qiongzhou Channel in June 2000.选择什么?为什么? a.thirteen-year-old b.thirteen-years-old c.thirteen years old d.thirteen-years old
答案选a 解析:“基数词-year-old” 一般用来做定语修饰名词. 例如: 一个13岁的男孩:a thirteen-year-old boy She was an eight-year-old girl that year. 而基数词+years old,常放在be动词后作表语.Anna is only five years old.