门可能整晚都没锁。
The door could have been left unlocked all night.
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Could英 /kʊd/|美 /kʊd/
解释
could 表推测，have been left 是 leave 的被动完成式。could have been left 表示对过去被动动作的推测，即说话者不确定门是否被锁了。
The door could have been left unlocked all night.
could 表推测，have been left 是 leave 的被动完成式。could have been left 表示对过去被动动作的推测，即说话者不确定门是否被锁了。