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