---Is Sam an student? ---Yes, he is _______. A. 8-years-old, 8 years old B. 10-years-old, 10 years o...
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题目内容：
---Is Sam an student? ---Yes, he is _______.
A. 8-years-old, 8 years old B. 10-years-old, 10 years old
C. 8-year-old, 8 years old D. 10-year-old, 10 years old
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