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New Concept English 3 Lesson 24--Gramma Problem

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New Concept English 3 Lesson 24--Gramma Problem
We often read in novels how a seemingly respectable person or family has some terrible secret which has been concealed from strangers for years.---为什么secret是单数?
He said with a smile as if he were talking about an old friend--为什么不是was?
some 可以指不确定的某一个 例如some day 不确定的某一天
were 在这应该是虚拟语气~