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_____should not be allowed to go out at night.

A.Twelve-year-old                        B.Twelve-year-olds

C.Twelve year old                         D.Twelve years old

 

【答案】

B

【解析】

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。

考点:合成词

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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