I have been away from home for 12 years.（改为过去时间状语

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• I have been away from home for 12 years.（改为过去时间状语
• I have been away from home for 12 years.（改为过去时间状语
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• 英语语法 关于If引导的条件状语从句或虚拟语气If i were on the spot that day,___________________________.A.I should be able to prevent the disaster from happening.B.I would have been able to prevent the disaster from happening选择那个?标准答案是B.这里使用的是虚拟语气吗?如果是,那不是应该使用If i had been on the spot that 这是我网上找到的解释,担不是非常理解:7.条件从句与结果主句所表示的时间不一致(1) 当条件从句与结果主句所表示的时间不一致（如一个是过去发生的，一个是现在发生的）时，虚拟语气的形式应作相应的调整。如：If you were in better health,we would have asked you to come.如果你身体好一些，我们早就请你来了。If we
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