How long __ Leo__ yesterday? He was very tired when he was back from the skating club.A did; skate B has ; been skating 选择哪一个,我认为A是 正确的,但答案是B.为什么?

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Howlong__Leo__yesterday?Hewasverytiredwhenhewasbackfromtheskatingclub.Adid;skateBhas;beenskating选择哪一

How long __ Leo__ yesterday? He was very tired when he was back from the skating club.A did; skate B has ; been skating 选择哪一个,我认为A是 正确的,但答案是B.为什么?
How long __ Leo__ yesterday? He was very tired when he was back from the skating club.
A did; skate
B has ; been skating
选择哪一个,我认为A是 正确的,但答案是B.为什么?

How long __ Leo__ yesterday? He was very tired when he was back from the skating club.A did; skate B has ; been skating 选择哪一个,我认为A是 正确的,但答案是B.为什么?
How long did 表过去时,表过去已经完成.事情过去了对现在也没什么影响,就用一般过去时了,也用不着过去完成时．所以如果是How long did Leo skate yesterday?意思就是昨天Leo已经滑过冰了.这件事就叙述完了.后面的那句话就不该出现了.
How long have been 表现在完成时,谈论你一直做某事有多长时间了,过去发生的事对现在还有影响.翻译：Leo昨天溜冰多长时间啊?
要注意下后面一个句子的情镜,当他从溜冰俱乐部回来的时候他已经很努力了.已经尽力了.说明他昨天晚上一直都在练习溜冰.
小技巧：现在完成时的基本特点是它和现在有密切的联系,或是讲迄今为止这一段时间的情况,或是讲一个影响现状的动作,这样它不是从时间上就是从后果上和现在联系起来.根据这个特点我们可以判断什么时候用一般过去时,什么时候用现在完成时.

是完成时，表示动作已经结束。
动作处于某种状态 用have/has been doing

how long表示多长时间，而skate是个动作，和how long搭配需要表示这个动作持续了多长时间，而持续多长时间就用been skating。

A How long did Leo skate yesterday ? He was very tired when he was back from the skating club.
B How long has Leo been skating yesterday ? He was very tired when he was back from the skating club.
结合后一句看，A，过去时，语法有问题；B：has been doing 过去持续某种状态

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