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职称英语
If we (know) ______ that the books were available, we would have bought them yes
If we (know) ______ that the books were available, we would have bought them yes
游客
2024-06-28
3
管理
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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