吉大考研英语改错真题答案如下：
1. The book that you borrowed from me was about history, and I had read it myself before you did.
2. Although the weather forecast said it would rain, we decided to go hiking anyway.
3. I was so exhausted after the long journey that I couldn't help but fall asleep on the train.
4. She is very good at playing the piano, and her performance was impressive at the concert.
5. The company is planning to expand its business into new markets next year.
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