Bill is ten years old．
He has a _________ sister.
| A．4 years old | B．4-year-old |
| C．4-years-old | D．4 years’old |
Bill is ten years old．
He has a _________ sister.
| A．4 years old | B．4-year-old |
| C．4-years-old | D．4 years’old |
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