Mwasures have been taken to solve the problem ,but it may be some time____ t

Mwasures have been taken to solve the problem ,but it may be some time____ t 英语翻译A.can't have been B.mustn't have been C.shouldn't have been D.wouldn't have been 用can't have been造句! haven't been in,have/haven't been to,have/haven't gone to can’t have been与couldn’t have been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 用must have been/done或can*t have been/done 改写句子 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 Both you and she( )there ,have you? A has been B hasn't been C have been D haven't been How long have been away from your t( 填空 I don't know when I have been loving Never benever seewon't see what might have been意思 lover、i won't love you until i have been It couldn't have been on the moon. 请问“I shouldn't have been here.”怎么翻译?