－I'm so sorry that you didn't win the skating marathon.
－How long _____ you ______?
－I skated for 5 hours.
A．have, been skatingB．were, skating
C．have you skatedD．did, skate
D

試題分析：句意：你沒有贏得滑冰賽，我很難過。你已經滑了多久了？5小時。題中用了I skated for 5 hours表示動詞的過去時表示動作在過去發(fā)生，所以問的時候也用一般過去時不用現(xiàn)在完成時，故選D
點評：動詞的時態(tài)是學習英語過程中非常重要的知識。現(xiàn)在完成時表示動詞在過去發(fā)生對現(xiàn)在造成的影響�，F(xiàn)在完成時往往和already,yet,for+一段時間，since+點時間的時間狀語連用。一般過去時只表動詞在過去發(fā)生，一般現(xiàn)在時表示習慣性的動詞或是客觀真理、事實。
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