8 year old：8岁（非形容词）
8-year-old：8岁的（形容词）切记8-years-old的用法是错的,8-year-old属于固定用法
8=eight,元音字母开头所以修饰它要用an
综上所述,选B
希望能够帮助你,有疑问欢迎追问,
Mark is A.a 8 year oldB.an 8-year-oldC,an 8-years-oldD.a 8 y
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