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   should not be allowed to go out at night.
A. Twelve-years-old   B. Twelve-year-olds
C. Twelve year old       C. Twelve year old
B

试题分析:英语中两个或多个单词中间可以用短横线连接起来,起一个相当于形容词的作用,这类单词叫做合成词。其一般构成规则就是其构成单词一般都要用原形。句意:晚上不允许十二岁的孩子们出去。结合语境可知本句中复合词指的是十二岁的孩子们。故用复数形式,选B。
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