I think __________ should have enough time to sleep.

A. twelve years old B. twelve-years-old

C. twelve-year-old D. twelve-year-olds

D 【解析】句意：我認為十二歲的青少年應該有足夠的時間睡覺。twelve years old十二歲，表示年齡；twelve-years-old形式錯誤，year不能用復數(shù)；twelve-year-old十二歲的，是一個形容詞，應修飾名詞；twelve-year-olds代詞，指十二歲的青少年。根據(jù)句意可知應選D。
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