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_______should not be allowed to get ears pierced.
A.Twelve-year-old B.Twelve-year-olds
C.Twelve years old D.Twelve years olds
B

试题分析:英语中国两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穿耳洞。选项CD结构有误,Twelve-year-old在本句中被用作名词,十二岁的孩子。结合语境可知主语为复数形式,故后面加s,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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