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造句! 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 用must have been/done或can*t have been/done 改写句子 How and what can I do I have been have no choice .I don't know how to say I think they were Canadian.I don't think they were.They can't have been Canadian.They must have been Australian.帮我看看有无语法错误 I think she was old.我认为她原来是老的?I don't think she was.She can't have been old.She must have been young.这怎么翻译I think it was cheap.I don't think it was.It can't have been cheap.It must have been expensive.同上.最好将语 He can't have been.He must have been.不是说单三用has吗?这里怎么用的have? I don't know when I have been loving 英语翻译A.can't have been B.mustn't have been C.shouldn't have been D.wouldn't have been can’t have been与couldn’t have been的区别? you can't push what you don't have can can't must mustn't have to don't have to的区别 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. be,must be,can't have been,must have been吗 must have been和can't have been和现在完成时有没有联系啊