He has ever locked a room without bringing the key to the door with him。 原句的本意应为强调房门钥匙: 他曾经把房门的钥匙锁在房间里。(他锁门时没把门钥匙带着) the key to the door——房门钥匙,其他钥匙无所谓,只要房门钥匙在。
一般过去语态:he once locked his key in the room. 或 he once left his key in a locked room. 对事情产生了一定影响: he had once locked his key in the room .或 he had once left his key in a locked room.