________ should not be asked to study at night on weekends.
| A．Sixteen years old | B．Sixteen year olds |
| C．Sixteen-year-old | D．Sixteen-year-olds |
________ should not be asked to study at night on weekends.
| A．Sixteen years old | B．Sixteen year olds |
| C．Sixteen-year-old | D．Sixteen-year-olds |
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