This sentence seemed to be a question, but in fact, it was a statement.
Professor Karl certainly knew why Kang Xue couldn't play the piano.
Kang Xue glanced at Professor Karl and said, "I don't have the music score, so I can't correct the mistakes."
Professor Karl smiled and said, "Since you want to prove your strength to me, then you shouldn't make mistakes. Even if you make a mistake, you should have the confidence and ability to pull it back to the right track. But since you can't do both, how can you prove your strength to me?"
Kang Xue didn't dare to say a word after being taught by Professor Karl, so in the end, she could only say gloomily, "Got it."
Professor Karl shook his head helplessly and gave Kang Xue 50 points for her class assignment.
Kang Xue originally thought that even if Professor Karl didn't like her work, he would give her a passing score of 60 on account that she was his student.