If we (know) ______ that the books were available, we would have bought them yes

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问题 If we (know) ______ that the books were available, we would have bought them yesterday.

选项

答案 had known

解析本题考查虚拟语气。根据句子结构，可以判断这句话是对过去事实进行相反假设的虚拟语气句，因此主句用情态动词+动词的完成式，从句用过去完成时。

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