Closed-loop thinking refers to a way of thinking in which tips and responses in various ways are used to form a closed loop in each operation in the process of work and study, so as to grasp the process in real time and adjust the direction in time.
The option "The manager asked Xiao Li to draw up a work plan within a week. After careful research, Xiao Li completed the plan and e-mailed it to the manager. More than ten days later, the manager specifically asked him: has the plan been written yet? Xiao Li said in surprise, I have sent it to you a long time ago" does not belong to closed-loop thinking.