She walked slowly into the hall and at once noticed that all the room doors were open,她慢慢地走进前厅,立即发现所有的房门都敞开着,yet following her regular practice she had shut them before going out.而她记得在出门买东西前,她按老规矩是把房门一一锁上的。——《新概念英语》
您好,那提问中为什么用了“shut”来表示锁门这个动作?