You must have been to London for many times,__you为什么选 haven‘t而不是didn't

You must have been really different then.I was.You wouldn’t have recognized me!怎么翻译阿 选择：You have been doing washing all the morning.You must be tired,( )you?A.mustn`t B.are C.aren`t D.must be,must be,can't have been,must have been吗 You must have been to London for many times,__you为什么选 haven‘t而不是didn't 反义疑问句You must have been there before,______?A.have you B.did you C.haven't you D.didn't you请说明理由,还有一道You must have been in Beijing last month,_______ A.aren't you B.did you C.weren't you D.didn't you Why didn't you answer the telephone last night?I did't hear the phone .I ___A:must be asleepB;must have been asleepA为什么不选啊 Dear! You must have been very happy now!是什么意思? It must have been so though for you,huh? can't have been和must have been每一个的用法 She can't have been Danish. and She must have been Swedish. must have been和can't have been和现在完成时有没有联系啊 用must have been/done或can*t have been/done 改写句子 you didn`t hear my knocking at the door; you______ soundly when i came in答案是must be sleeping 是否应是must have been sleeping can't have been和can' have done有什么区别或者must have been和must hane done;may have been和may have done I phoned you at 9:00 this morning but got no answer.l am sorry .l _____ the bell.l____in the garden .A haven't heard,must have been.B didn't have heard,must beC didn't hear,must have been D didn't hear,must be 选哪个?为什么? You ( )be tired .you have only been working for an hour.A.must B.wont C.cant D.may not must have been done must have done must have/ must have been的区别