题目内容

_____should not be allowed to go out at night.
A．Twelve-year-oldB．Twelve-year-olds
C．Twelve year oldD．Twelve years 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:晚上不应该允许十二岁的孩子们出去。结合语境可知本句中合成词起名词作用，作主语，复数形式，在词尾加s，故选B。
点评：英语中很多单词是通过合成的方式构成的，他们叫做合成词，常见合成词有合成名词、合成动词、合成形容词等几种类型，其语法功能与普通单词用法一样。其一般构成规则就是其构成单词一般都要用原形，这也是一些考试中常考的题型，牢记即可。
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