I felt tired but excited ----------------

I felt tired but excited--------I learned a lot about the history of the city.
中间应该填“because”.
此句翻译为:
我觉得很累,但很兴奋--------我学到了很多关于这个城市的历史.
前后具有因果关系,所以应该填“因为”.
你明白了吗?

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