how long have you done that为什么done 处不能用been doing

How long have you been Do you have any long distance friendship?How do you maintain them Do you have any long distance friendships?How do you maintain them?回答 Do you remember____in Paris last year?A.how long have you stayed B.how long did you stayC.how long you stayed D.how long you have stayedDo you remember____in Paris last year?For only three months.A.how long have you stayed B.how long did you stayC.ho How long do you think____in this area?A.do I teach B.I have taught C.have I taught 请教long have mang you how pencils do怎么连词成句 How important do you think it is for businesses to have long-term plans?英文说几句 how long do you have to date someone to call it a relationship?求翻译. 这几个英语句子有什么区别How long do you learn EnglishHow long have you been learning EnglishHow long are you learning English还有 How long have you learned English?不用进行时态可以么 有什么区别 how long do you exercise every how long do you go to school how long do you read every night? how long do you love me how long do you live in japan how long do you read every night? how long do you think.怎么翻译 how long have you been learning english? How long have you been studying?