作业帮how long haveyoubeen和how long did you skate?什么区别?
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how long haveyoubeen和how long did you skate?什么区别?
how long haveyoubeen和how long did you skate?什么区别?
how long haveyoubeen和how long did you skate?什么区别?
how long haveyou been（不完整）现在完成时,动作延续到现在 how long did you skate过去时,过去进行的动作,没有延续