请问could not have done/might not have done可用于虚拟语气中吗

请问have not是否等于don't have 请问have not是否等于don't have But that he saw it,he ______ it.A.could not have believed B.could not believeC.did not believe D.don't believe请问这个是应该选A还是C?是虚拟语气吗? could not have done 谁知道could not have 请问could not have done/might not have done可用于虚拟语气中吗 must not have been;could not have Could not help but have to could i have ---------stamps?sorry,i don't have----------------填词 could i have ---------stamps?sorry,i don't have----------------填词 ●关于I DONT HAVE ENOUGH MONEY◆I DON’T HAVE ENOUGH MONEY是个否定句,加了DON’T.那COULD YOU PLEASE NOT DROP YOUR PENS?也否定.为什么加了NOT? 英语翻译you know you could have stopped the rain if you used your brains,but you don't have any.请问have any这里指的是什么? 请问I could not be more sure. Could you please + don't or not to . have no,have not ,don;t have的用法区别 I don not have ____(some) cakes . if my life don not have if my life don not have you We were the second last Americans to meet with Chairman Mao ,but he could not have been more gracious.请问如何分析the second last Americans 如何理解he could not have been more gracious?