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

試題分析：句意：我認為一個18歲的男孩不夠認真。eighteen-year-old18歲的，用做定語放在名詞前面，有連字符時year不用復數(shù)，eighteen的讀音以元音開頭，所以用冠詞an，故選D。
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