Mr Green is a doctor of ________ and his daughter Ann is ________ college student.A.50 years old; an 18-year-oldB.50-year-old; an 18 years oldC.50 years old; a 18-years-oldD.50-years-old; a 18 year old
网友回答
A解析点拨：a doctor of 50 years old“一名50岁的医生”，而后一个空是形容词修饰名词college student；l8-year-old (数字-单数名词-形容词) 相当于一个形容词。