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

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

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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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