_________ 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(gè)或多個(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)該被允許在晚上出去.結(jié)合語境可知本文主語是復(fù)數(shù),故選B.
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