다음 글의 밑줄 친 부분 중, 어법상 틀린 것은? [3점]
greg felt like a failure if he didn’t receive every single point on every single assignment. a grade of 95 left him ①asking, “how did i fail to achieve 100?” greg realized that his drive for perfectionism was putting him into a state of constant stress. he decided ②to work on stress management. he came up with the creative idea of ③posting notes everywhere with the simple message, “92 is still an a.” gradually, these simple reminder notes allowed greg to have a different point of view and ④realized that he didn’t have to be perfect at everything. he still could earn an “a” in class, but with ⑤much less pressure.

몇번이 틀린문제 인지. 왜 틀렸는지랑
맞는 번호들도 어떤 문법에 해당하는지 상세하게 설명해주심 정말 감사하겠씁니다.