问题描述:
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!
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!
问题解答:
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