how long did you skate today?和how long have you 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 英语翻译How long did you skate today?How long have you been skat How long ( ) you ( A.did skate B.have been skating 在这可不可以选A? How long have you been skating? how long did you skate? how long have you been dancing today? How long didi you skate today? how long have you been skating?怎么回答 how long have you been reading the book和how long did you rea 八年级下册英语书语法：How long have you been skating?I've been skating