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I think  _______ boy is not serious enough.
A.a eighteen-year oldB.an eighteen-years-old
C.a eighteen years oldD.an eighteen-year-old
D

试题分析:句意:我认为一个18岁的男孩不够认真。eighteen-year-old18岁的,用做定语放在名词前面,有连字符时year不用复数,eighteen的读音以元音开头,所以用冠词an,故选D。
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