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外语
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.
admin
2014-07-10
19
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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本试题收录于:
大学英语三级A级题库大学英语三级分类
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大学英语三级A级
大学英语三级
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