120-metres long 120-metres-long 120-metre long 120 metres long 哪个对?
问题描述：
120-metres long 120-metres-long 120-metre long 120 metres long 哪个对?
答
120 metres long 与另一个120-metre-long 对.前者做表语（用在be动词后）,后者做定语,后面必须加一个名词.用法同：He is 12 years old.He has a twelve-year-old son.