I first met Lisa thhree years ago when we ___at a radio stat

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I first met Lisa thhree years ago when we ___at a radio station together.
A.have worked B.had been working C.were working D.had worked

选C解析：
when 表示“何时”“什么时候”时,如果是从句从句的引导词,可以引导现在时、过去时态或将来时态等.译为：当...的时候,是瞬间性的.
因此when通常不用于现在完成时.如：
你什么时候和他首次见面的?
误：When have you first met him?
正：When did you first meet him?
而ABC均问现完,因此均可排除

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