I know, it's the teacher, the official translation of the textbook, and the other one is Teacher Peng. It was passed at one time in more than two months, and the teachers were really responsible. The questions and answers of WeChat group are all given by professional teacher Peng, and they often answer questions in the middle of the night. Thank you very much.

Our class said it was about 90% pass rate, and we all studied well in that class.