“你今天共花了多长的时间滑冰?”
how long did you skate today?
（问这句话的时候,是对方早已经结束滑冰了）－－过去时
how long have you been skating today
（问这句话的时候,是对方仍在继续滑冰或刚准备要结束滑冰）－－现在完成进行时
how long did you skate today?和how long have you been skating today 有何区别
how long did you skate today?和how long have you been skating today 有何区别
英语人气：129 ℃时间：2019-08-29 07:20:31
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