问题
选择题
_____ should not be allowed to go out at night. [ ]
A. Twelve-years-old
B. Twelve-year-olds
C. Twelve years old
D. Twelve years olds
答案
答案：B
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_____ should not be allowed to go out at night. [ ]
A. Twelve-years-old
B. Twelve-year-olds
C. Twelve years old
D. Twelve years olds
答案：B