问题描述：
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?
A 23 years old B 23-year-old c 23-years-old D 23 year olds 为什么?
问题解答：
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