你怎么没去参加聚会？

___How ___come you missed the party?

那家报纸怎么没核实事实就刊登了那个报道？

___How ___come the newspaper published that story without checking the facts?

项目截止日期怎么提前了却没有通知团队？

___How ___come the project deadline was moved up without informing the team?