___________ should not be allowed to go out at night.

A．Twelve-years -old B．Twelve-year-olds 
C．Twelve years old D．Twelve year olds 

B

解析試題分析：句意：十二歲孩子不允許晚上外出。Twelve-year-olds十二歲的，這里用作名詞，復(fù)數(shù)。注意有連字符時year不能用復(fù)數(shù)；allow sb to do允許某人做某事，其被動形式是sb be allowed to do; go out出去；at night.在晚上。
考點：考查年齡表達。

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