Walter offered us a lift when he was leaving,but ___ our wor

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Walter offered us a lift when he was leaving,but ___ our work,we turned down the offer.
A not finished B not having finished C not finishing D having not finished
为什么选B,不选C

C not having finished= hadn't finished,这里实际上是用过去完成时,因为是插入语（没有主语,不是一句完整的话）,所以要调整分词形式.
过去完成时表示动作发生在过去的过去,就是发生在turned down the offer的过去
整句话意思是：沃尔特在他走之前提供给我们一个升职的机会,但我们还没有完成工作,就拒绝了沃尔特给的升职机会.

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