阶梯倍投方案0.9

简介：Su Can's ears trembled. The sight of people in the classroom turning upside down was right. He covered the paper with his backhand and put it under the English book. He felt uneasy again. When Ling Zhenzhen walked into the classroom and turned around, he put down Li Tao's math paper together with it. The paper is folded into the math book together with its own math paper.