问题
选择题
The ________ boy can play chess well.[ ]
A. 3 year old
B. 3 years old
C. 3-year-old
D. 3-years-old
答案
答案：C
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The ________ boy can play chess well.[ ]
A. 3 year old
B. 3 years old
C. 3-year-old
D. 3-years-old
答案：C