something happened before someone could do something
在某人能够做某事之前,发生了某事
这是一种相对固定的表达方式.
楼主的句子：刚才有人敲我的门,在我能滕出空来开门前,他就离开了.（言下之意,我没看到是谁敲门）
如果用 when,意思为,当我能滕出空来开门时,他离开了.
我开门和他离开是同时发生,表示我可能还看得到他.而用 before,表示已经他已经走了,无可挽回了.
Someone knocked on my door just now.But he left ------ I cou
5个回答
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