_______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

解析試題分析：英語中國(guó)兩個(gè)單詞中間可以用短橫線連接起來，起一個(gè)相當(dāng)于形容詞的作用，這類單詞叫做合成詞。其一般構(gòu)成規(guī)則就是其構(gòu)成單詞一般都要用原形。其復(fù)數(shù)形式一般是在最后一個(gè)單詞后面加s。句意:十二歲的孩子不應(yīng)該被允許穿耳洞。選項(xiàng)CD結(jié)構(gòu)有誤，Twelve-year-old在本句中被用作名詞，十二歲的孩子。結(jié)合語境可知主語為復(fù)數(shù)形式，故后面加s，選B。
考點(diǎn)：合成詞
點(diǎn)評(píng)：英語中很多單詞是通過合成的方式構(gòu)成的，他們叫做合成詞，常見合成詞有合成名詞、合成動(dòng)詞、合成形容詞等幾種類型，其語法功能與普通單詞用法一樣。其一般構(gòu)成規(guī)則就是其構(gòu)成單詞一般都要用原形，這也是一些考試中�？嫉念}型，牢記即可。

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