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i first met Lisa three years ago when we ------at a radio st

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i first met Lisa three years ago when we ------at a radio station together .A have worked Bhad bee
i first met Lisa three years ago when we ------at a radio station together .
A have worked Bhad been working C were working D had worked 说理由哟
C were working
时间状语从句用完成时,从句动作和主句动作是先后关系.例如:Go on to consider the next question when(after) you have worked out the first one.
时间状语从句中用进行时,表示在从句动作进行的过程中发生了主句动词表示的动作.