关于英语完成时1.I have bought a bike already.为什么那个bought不要变成持续的"had

I have already bought a bike.(改为否定句) He have already bought a new bike改错 I have just bought a new bike 这里为什么用bought 1.he has already bought a newspaper.改一般疑问句 2.i have already 求教一道英语选择题1.He bought a bike last year.He has had the bike () I have bought the bike和I have bought the bike for two years, 英语翻译I bought a bike today I have bought a newspaper_______ how have you __the bike?A bought B borrowed C had D lent how have you ___the bike?A bought B borrowed C had D lent How long have you____the bike?A.had B.been C.bought拜托各位了 3Q 英语选择题---Have you bought a new bike?---yes,in fact,my bike is