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michael phelps is_____ and he got 8 gold medals in tje 29TH

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michael phelps is_____ and he got 8 gold medals in tje 29TH beijing olympic GAmes
A 23 years old B 23-year-old c 23-years-old D 23 year olds 为什么?
michael phelps is_____ and he got 8 gold medals in tje 29TH
A
单词之间加上“—”后作形容词 修饰名词
如 a 23-year-old man
记住不要加“s”
因此排除 B C
固定用法 23 years old
永远没有 23 year olds
排除D