She can't have been Danish. and She must have been Swedish.

She can't have been Danish. and She must have been Swedish. he can't have been Danish.he must have been Swedish. she must have been forty.变反意疑问句! can't have been和must have been she must have been ill.------she didn\t come to school yeste be,must be,can't have been,must have been吗 She must have been very exhausted recently,_____she A didn't She must have been a beauty in her day. Your dream will come true.She must have been wonderful. she must have been a temporary worker 是什么时态? can't have been,must have been 结构里是不是不要把have been当现在完成时看,就把它 用must have been/done或can*t have been/done 改写句子