Sam is my friend, he is a _____ boy now. A. 9 years old B. 9-years-old C. 9-year-old D. 9-years’ old...
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题目内容：
Sam is my friend, he is a _____ boy now.
A. 9 years old B. 9-years-old
C. 9-year-old D. 9-years’ old
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