过去将来完成进行时指动作持续到过去某时后的另一时刻且进行下去，常用结构为would/should have been doing。例如： A: What would John have been working on after 11pm last Thu evening? 约翰上周四晚11点后将一直忙什么？ B: He would have been programming si... 阅读全部 »