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had she not come) to our help when we were in trouble,we cou

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had she not come) to our help when we were in trouble,we couldn't have finished our task on time.
括号里面是什么结构啊.if she didn'tcome怎么错了
因为后一句是have finished our task,即过去完成时,所以前面只能用完成时.
如果后面是we couldn't finish our task的话,就可以用if she didn't come