_________ should not be allowed to go out at night.
A．Twelve-years-old B．Twelve-year-olds
C．Twelve year old D．Twelve year olds
B
考查合成詞. 英語中兩個或多個單詞中間可以用短橫線連接起來，起一個相當于形容詞的作用，這類單詞叫做合成詞。其一般構成規(guī)則就是其構成單詞一般都要用原形。其復數(shù)形式一般是在最后一個單詞后面加s.句意:十二歲的孩子不應該被允許在晚上出去.結合語境可知本文主語是復數(shù),故選B.
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