题文
My sister has been learning skating for __________.
| A．two and a half years |
| B．two and a half year |
| C．two year and a half year |
| D．two years and a half years |
My sister has been learning skating for __________.
| A．two and a half years |
| B．two and a half year |
| C．two year and a half year |
| D．two years and a half years |
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