HOW LONG HAVE YOU BEEN SKATING A TREE MILES B THREE HOURS

HOW LONG HAVE YOU BEEN SKATING A TREE MILES B THREE HOURS How long have you been skating? How long ( ) you ( A.did skate B.have been skating 在这可不可以选A? how long( )you( )a doctor?Three years A ,have:been B,have:be how long have you been skating?怎么回答 how long have you ___ there?---About three years.A.been B.go 八年级下册英语书语法：How long have you been skating?I've been skating how long did you skate today?和how long have you been skating How long have you been skating?与How long did you skate?的区别 How long have you been skating?How long did you skate?中文翻译的区 How long have you been a teacher ( )have you been a great volunteer?A.How ohten B.How long C.