____should not be alowed to go out at night.A.Twelve-years old B.Twelve-year-olds C.Twelve year old D.Twelve years olds选什么 为什么?

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____should not be alowed to go out at night.A.Twelve-years old B.Twelve-year-olds C.Twelve year old D.Twelve years olds选什么 为什么?
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____should not be alowed to go out at night.A.Twelve-years old B.Twelve-year-olds C.Twelve year old D.Twelve years olds选什么 为什么?
____should not be alowed to go out at night.
A.Twelve-years old B.Twelve-year-olds C.Twelve year old D.Twelve years olds
选什么 为什么?

____should not be alowed to go out at night.A.Twelve-years old B.Twelve-year-olds C.Twelve year old D.Twelve years olds选什么 为什么?
B
twelve-year 相当于一个形容词,意思是“12岁大的”,这种中间有横线的,后面那个year不能是复数,虽然前面是12.
old在这里相当于是一个名词"...大的人;...岁的人",而从句子意思看出,不是具体针对某一个人,而是泛指,所以要用old的复数olds