题目内容

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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