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She has read so many books that it seems as if everything sh

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She has read so many books that it seems as if everything she knew,为什么用knew而不用knows!
She has read so many books that it seems as if everything sh
这是虚拟语气的形式,事实上,她不可能什么都知道
再问: 还是有点不懂,虚拟语气就一定要用knew吗?
再答: 表示与现在事实相反, as if 之后动词用【过去式】

表示与过去事实相反, as if 之后动词用【had+ 过去分词】