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When did you start skating?

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When did you start skating?
A.Since two years ago.B.Since I was nine years old.
C.For six hours.D.Five years ago.
When did you start skating?
D.Five years ago
再问： 为什么，请逐个分析。
再答： ABC都是现在完成时的时间状语 D是一般过去时的时间状语
再问： 能告诉我这个问句用现在完成时怎么说吗？
再答： How long have you learned skating ?或 Since when have you learned skating?
When did you start skating? when did you start skating?——（ ） When did you start skating?的答语可以是when i was 7 years when did you start to______? When did you start out? when did you start your homework when did you start to learn english? when did you start （）(hiccup) 1.--- When did you start colleting stamps? 怎样回答When did you start school? -（）did you start skating、 - Fire years ago.选什么?是不是选B When did it start?