Tom you're only_.I don't think a _boy should be allowed to drive alone.A.fifteen-year-old;fifteen-year-oldB.fifteen years old;fifteen-year-oldC.fifteen years old;fifteen years oldD.fifteen-year-old;fifteen years old正确答案:B求原因,要详细

Tom you're only_.I don't think a _boy should be allowed to drive alone.A.fifteen-year-old;fifteen-year-oldB.fifteen years old;fifteen-year-oldC.fifteen years old;fifteen years oldD.fifteen-year-old;fifteen years old正确答案:B求原因,要详细
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 drive alone.A.fifteen-year-old;fifteen-year-oldB.fifteen years old;fifteen-year-oldC.fifteen years old;fifteen years oldD.fifteen-year-old;fifteen years old正确答案:B求原因,要详细
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.

很简单，别看的太复杂，fifteen-year-old 连起来看做是一个名词，但后面的fifteen years old 都是单独的单词组合，所以fifteen后面的year要加s而前面的不用

fifteen-year-old 形容词结构
fifteen years old 名词词组