Tom is a_____young man and we all like himA.15-years-old B.15-year-old C.15 year old D.15 years old为什么选B

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Tom is a_____young man and we all like him
A.15-years-old B.15-year-old C.15 year old D.15 years old
为什么选B

B.复合形容词做定语

这是个“数词+名词单数+形容词”结构的合成形容词
再如:
a three-foot-tall tree
请及时采纳,不懂继续问
(*^__^*) 祝学习进步! 谢谢!

这是个固定的用法,因为这里是做定语修饰man,D选项是做表语用的,