33．Li Lei's brother is boy．He studies hard．A．a 11-year-old B．an 11-years-oldC．an 11-year-old D．a 11 year old 【查看更多】

 

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Li Lei's brother is ________ boy．He studies hard．

A．a 11-year-old                                    B．an 11-years-old

C．an 11-year-old                                     D．a 11 year old

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