Excellent papers recommended by the school will be included in the database. Don't worry about ordinary papers. Many people in our school copied the old ones. Nothing serious. It should be noted that the database is constantly updated, and the repetition rate detection may be somewhat biased. Just pay attention to yourself. Don't copy the previous student's, he copied it online, and then it was not published at that time. Later, HowNet included it. This will be a tragedy. Good luck with your pass.