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!

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MrGreenisadoctorof()andhisdaughterAnnis()collegestudent.A.50yearsold：an18-year-oldB.50-year-old;an18

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 ( )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 ( )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!
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.

若把B改成 50-year-old woman 就可以选
50 years old和50-year-old从意思上来讲虽然相同
但词的性质不同在句子中所承当的成分也不同
前者词性是名词后者是一个形容词后面必须跟有所修饰的人或物
所以 B选项是错误的

因为ie，，意思错了！！

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