---Have you done your homework,Bob?---Yes,I____it twenty minutes ago.A.have done B.didC.had done D.do正确答案是B,为什么A不行?

What would you have done What Have You Done 歌词 What would you have done what have you done today what have you done lately? how could you have done What have you done recently? what have you done this what you have done for us.have you have done for us.have done是什么 Have you done your homework yet? What excellent work you have done!翻译 What have you done?怎么回答? Look what you have done伴奏 What have you ever done?怎么回答? smart you have done a good job What have you done?怎么回答? What have you done?怎么回答