问题
选择题
An boy worked out the English problem. [ ]
A. 8 years old
B. 8 years
C. 8 year old
D. 8-year-old
答案
答案：D
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An boy worked out the English problem. [ ]
A. 8 years old
B. 8 years
C. 8 year old
D. 8-year-old
答案：D