_____should not be allowed to go out at night.
A.Twelve-year-oldB.Twelve-year-olds
C.Twelve year oldD.Twelve years 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:晚上不應(yīng)該允許十二歲的孩子們出去。結(jié)合語境可知本句中合成詞起名詞作用,作主語,復數(shù)形式,在詞尾加s,故選B。
點評: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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