I think _B__should not be allowed to drive A sixteen years old B sixteen-year-olds 为啥选B?

题目

I think _B__should not be allowed to drive A sixteen years old B sixteen-year-olds 为啥选B?

答案

sixteen-year-olds 是 十七岁的人 的意思 算是个合成词 代表一类人
而A sixteen year old 就是相当于个形容词嘛 十七岁的