____you have studied English history for more than 3 years.don't you know when the nation wasfounded?为什么填since不填as?

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____youhavestudiedEnglishhistoryformorethan3years.don''tyouknowwhenthenationwasfounded?为什么填since不填as?

____you have studied English history for more than 3 years.don't you know when the nation wasfounded?为什么填since不填as?
____you have studied English history for more than 3 years.don't you know when the nation was
founded?为什么填since不填as?

____you have studied English history for more than 3 years.don't you know when the nation wasfounded?为什么填since不填as?
Since这里是做既然讲.既然你已经学习英国历史超过了三年,难道你不知道.
Since you're not interested,I won't tell you about it.既然你不感兴趣,我就不告诉你了.(见金山词霸例句).