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!

where is your brotherAt______A.Mr Green's B.the Smith'sC.doctor'sD.house of Mr John为什么选A She told me____her teacher.A Mr Green isB that Mr Green is C if Mr Green wasD Mr Green was mr brown is a doctor对a doctor 提问 Mr Green is a father__,__,__. This is Mr Green You are young and handsome.___________.A.SO are Mr.Green B.SO Mr.Green is C.So is Mr.Green D.SO Mr.Green WHERE IS YOUR SISTER -AT______ A:THE SMITH'S B DOCTOR'S C MR green's D house of MR Green 为什么答案选C，越来越不清楚了呢 ( )33.Mr.Green is an expert doctor.He can even save _______ people.A.dead B.died C.death D.d为什么选B mr.green is mrs.green is （ ） This is Jim Green,____. A.Mr Jim B.Mr Green C.Miss Jim D.Miss Green Why?-->Mr.Black,Mr.White,Mr.Brown,Mr.Green,Mr.Blue,Mr.Red,Mr.Yellow,Mr...Mr.Black,Mr.White,Mr.Brown,Mr.Green,Mr.Blue,Mr.Red,Mr.Yellow,Mr.Why?Mr.Orange,Mr.Purple,Mr.Violet,Mr...Is it any kind of colour can make a person's name?Why?Is there any reason? mr Wang is() good doctor mr green is now a holidaya inb withc on Mr green is a teacher.He works in the s____ 排序 coat ,river ,Mr.Green ,a ,the ,is ,beside ,washing Mr.Green is in a blue hat.的意思.[谢主隆恩] mr brown is a doctor.把a doctor划起来,划线部分提问 Is mr green your u_____?