Istillcannotfigureou的精選

問題詳情：一Istillcannotfigureoutwhyhemissedhisflight．一He       anaccidentonthewaytotheairport．A．couldhavehad     B．shouldhavehad     C．wouldhavehad    D．musthavehad【回答】A知識點：虛擬語...