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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Yesterday1boughtfromtheshop.A、anoldwoodroundtableB、aroundoldwo