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?

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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?
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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 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 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?
B
18( eighteen ) 是元音开头,
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B

既然是不定冠词,自然是a或者an了。具体用哪个取决于接下来单词的发音,跟a/an的基本规则相同。

18,eighteen,首字母是发音是元音,所以这应该轩B,a/an叫不定冠词,the是定冠词