2. 外语
  3. If I______they were on sale online, I wouldn’t have bought the traveling bags in this store.

If I______they were on sale online, I wouldn’t have bought the traveling bags in this store.

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问题 If I______they were on sale online, I wouldn’t have bought the traveling bags in this store.
选项 A、know
B、knew
C、had known
D、have known
答案C
解析 本题考查if虚拟语气的用法。if虚拟语气的构成规则如下：表示与过去事实相反，形式为“If+主语+had done，主语+should／would／could+have done”；表示与现在事实相反的情况，形式为“If+主语+did，主语+should／would／could+do”；表示与将来相反或不大可能实现的事实，形式为“If+主语+did／were to do／should do，主语+should／would／could+do”。本题表示与过去事实相反，主句使用了would have done形式，故从句应使用过去完成时，因此C)为本题的答案。
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