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 虚拟语气用在与过去事实相反的条件从句中时，条件从句的谓语用had+过去分词，主句的谓语用“should/would +have+过去分词”。
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