Can it have been on the sportsground ,()you lost your watch yesterday?a;that b;which c;where d;in that选a,我选了c,这两个答案还是不够清楚啊……这样一换倒是懂了……

It couldn't have been on the moon. you can have been have been on have been on the room is in the terrible mess ,it can not have been cleaned .为什么用can not have been为什么不用should not have been When I went there on what would have been our honeymoon.Friends ,Season1,Episode 20里面,BARRY 说给RACHEL听的：we can ,we can go to Aruba,When I went there on what would have been our honeymoon,it was really nice,you 'd have loved it.我理 用can't have been/done must have been /done 改写句子例：I don't believe he did it 答:He can't have done it问：I don't believe you tried very hardI think he passed all the examsI don't bellieve you were at the office on SuadayI think she met 用（can't ） （ have been/done ） （must have been /done） 改写句子例：I don't believe he did it 答:He can't have done it问：I don't believe you tried very hardI think he passed all the examsI don't bellieve you were at the office on 用（can't ） （ have been/done ） （must have been /done） 改写句子例：I don't believe he did it 答:He can't have done it问：I don't believe you tried very hardI think he passed all the examsI don't bellieve you were at the office on have been on的用法 have been on加什么 1 （）,it immediately ran away.a.Observing her b.On being oberved c.Having been oberved d.On her being oberverd2 The experts were now fully convinced that the animal ( ) a puma.a.must be b.should have been c.can only be d.could only have been How can a girl have been eleven on her last birthday,and be thirteen next birthday? How can you possible miss the news?It[ has been] on TV all day long.为什么? It should have been left the room is in the terrible mess ,it can not have been cleaned .为什么用can not have beenWith all the work on hand ,he could not have gone to the cinema last night.为什么用could not have gone 而不用 should not have gone.Eve was late for cl have lasted 和have been on区别 i would have been there on the spot had it not been for the traffic problem怎么翻译