Although Steven is a boy .He knows a lot of Chinese characters. A. six years old B. six-years-old C. six-year-old D. six-year-olds 查看更多

 

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Although Steven is a _____ boy. He knows a lot of Chinese characters.
[     ]
A. six years old
B. six-years-old
C. six-year-old
D. six-year-olds

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