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he is ____boy 1.a eight-year-old 2.an eight-year-old 3.an eight-years-old 4.a eight year old

题目详情
he is ____boy 1.a eight-year-old 2.an eight-year-old 3.an eight-years-old 4.a eight year old
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答案和解析
2 an eight-year-old