50-year-old与50 years old在语法中的区别
问题描述：
50-year-old与50 years old在语法中的区别
It is said that the brige is_____.
A eighty meters long B eighty-meters-long
C eighty-meter-long D an eighty-meter-long
正确答案是C
答
选A
50-year-old 做修饰名词的（定语）形容词
50years old 则不是,它做表语