Mary is _________ primary school student in Beijing.
| A．a 8-year-old | B．an 8-year-old | C．a 8-years-old | D．an 8-years-old |
Mary is _________ primary school student in Beijing.
| A．a 8-year-old | B．an 8-year-old | C．a 8-years-old | D．an 8-years-old |
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