should not be allowed to go out at night.
A. Twelve-years-old   B. Twelve-year-olds
C. Twelve year old       C. Twelve year old
B

試題分析：英語中兩個或多個單詞中間可以用短橫線連接起來，起一個相當(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。句意:晚上不允許十二歲的孩子們出去。結(jié)合語境可知本句中復(fù)合詞指的是十二歲的孩子們。故用復(fù)數(shù)形式，選B。
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