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

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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
(had she not come) to our help when we were in trouble,we co
虚拟语气,省略IF,had提前.if he had not comet o our help when we were in trouble,we couldn't have finished our task on time.
(与过去事实相反)