你滑冰了多久?我滑了两个小时了.
不能换成现在完成时.因为“滑冰”这个动作中间没有间断而是一直连续的（for two hours表明一直在滑）,所以不能用现在完成时来提问,只能用过去式提问；除非是滑完了已经停止一段时间了才能用现在完成时提问.
-How long did you skate?-I skated for two hours.
4个回答
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