He can't have been ill.

He can't have been ill. He can't have been ill是现在完成时? He must have been ill,___ he? he can't have been Danish.he must have been Swedish. He can't have been.He must have been.不是说单三用has吗? he can't haue been a dcntist.he must have been a doctor. can't have been和must have been he can't have been there 反义疑问句 后面怎么填阿~ (Having或Have) been told many times though,he still can't und 关于can't have been的句子 用can't have been造句! 同义句He didn‘t have a picnic because he was ill. He did't have