题目内容

_________ should not be allowed to go out at night.
A．Twelve-years-old B．Twelve-year-olds
C．Twelve year old D．Twelve year olds
B
考查合成词. 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。其复数形式一般是在最后一个单词后面加s.句意:十二岁的孩子不应该被允许在晚上出去.结合语境可知本文主语是复数,故选B.
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