作业帮 > 英语 > 作业

Mr Green is a doctor of ( )and his daughter Ann is ( )colleg

来源:学生作业帮 编辑:大师作文网作业帮 分类:英语作业 时间:2024/11/12 23:07:16
Mr Green is a doctor of ( )and his daughter Ann is ( )college student.
A. 50 years old:an 18-year-old B.50-year-old ;an 18 years old
答案是A,可是为什么不能选B?请指导我一下!谢谢您!
Mr Green is a doctor of ( )and his daughter Ann is ( )colleg
意思为格林先生是个五十多岁的医生,他的女儿是个18岁的大学学生.
因为 数字-year-old 这种形式是一个形容词性的,你可以把它看成一个形容词,所以后面一定要加名词.而前半句,后面没有名词,所以要用名词性的短语;而后半句,是要修饰名词,只有形容词可以修饰名词.