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3.Liu Ming is_____18-year-old student.He got a gold medal in

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3.Liu Ming is_____18-year-old student.He got a gold medal in the competition.
A.a B.an C.the D./
像这种:num.-year-old的结构,前面的不定冠词用什么?用的依据是什么?
3.Liu Ming is_____18-year-old student.He got a gold medal in
B
18( eighteen ) 是元音开头,
加油!不明白再问!如果帮到你,请采纳,谢谢!
再问: 与num.-year-old的结构无关吗?
再答: 与结构无关,关键是数字(是元音开头用an,以辅音开头用a ,如 a nine-year-old boy )