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Tom you're only_.I don't think a _boy should be allowed to d

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Tom you're only_.I don't think a _boy should be allowed to drive alone.
A.fifteen-year-old;fifteen-year-old
B.fifteen years old;fifteen-year-old
C.fifteen years old;fifteen years old
D.fifteen-year-old;fifteen years old
正确答案:B
求原因,要详细些.说明 fifteen-year-old 和fifteen years old 的区别.
谢谢!
Tom you're only_.I don't think a _boy should be allowed to d
答案为B
前面表达的是“十五岁”,用fifteen years old;属于名词性质,后面表达的是“十五岁的”.用fifteen-year-old属于形容词性质.