opened这里从时间状语at 8:00（指八点这个时点）来看,应该是强调动作“开门”
说开,关的状况 一般用形容词
开着的 open
关着的 closed
He is sleeping with the door closed and the windows open.
请及时采纳,不懂继续问(天天在线）.(*^__^*) 祝学习进步! 谢谢!