问题标题：
tomisa___boy.A.thirteenyearsoldB.thirteen-years-oldC.thirteen-year-old
问题描述：
tomisa___boy.A.thirteenyearsoldB.thirteen-years-oldC.thirteen-year-old
郭瑜茹回答：
tomisa___boy.A.thirteenyearsoldB.thirteen-years-oldC.thirteen-year-old
选C
athirteen-year-oldboy
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