________ should not to be allowed to work at night.
| A．Sixteen-year-olds | B．Sixteen-years-old |
| C．Sixteen year olds | D．Sixteen-years-olds |
________ should not to be allowed to work at night.
| A．Sixteen-year-olds | B．Sixteen-years-old |
| C．Sixteen year olds | D．Sixteen-years-olds |
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