____should not be alowed to go out at night.

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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?

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
再问：不是加横线的词每一个都不能有S么？
再答：不好意思，我刚才没解释到位，现在重新解释： twelve-year-old 本来相当于一个形容词，意思是“12岁大的”，但现在把它看成一个名词来用，而且根据句意，应该用复数，所以加了s. 比较难以理解的可能是一个形容词怎么说当成名词用就当成名词用了呢？我感觉是“只可意会，不可言传”，你多读几次，应该就可以理解了。

选择( )should not be allowed to go out at night. _____ should not be allowed to go out at night. Ten-year-olds should not be allowed to go out at night. （）＿＿＿should not be allowed to go out at night A.Twelve-years ___should not be allowed to go out at night.a.Twelve-years-o go out at night My father did not agree me to go out alone at night. 1.It's better for you not to go out alone at night.(同义句) ___ 同义句：You'd better not go out at night she is a__ to go out alone at night. Sally isn't a___ to go out alone at night. The little boy is a_____ to go out at night.