——My lovely sister is a girl and she sings very well.
| A．twelve years old | B．twelve-year-old |
| C．twelve-years-old | D．twelve-year-olds |
——My lovely sister is a girl and she sings very well.
| A．twelve years old | B．twelve-year-old |
| C．twelve-years-old | D．twelve-year-olds |
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