Under the leadership of the soldiers, Du Yu came to the teaching building, at the end of the west side of the first floor.


    "Three classes a year." Du Yu looked up at the house number.


    Along the way, all the other classes were brightly lit, but the third class at the end of the corridor was completely dark inside.


    The leading soldier nodded to Du Yu, then closed the team and left.


    Leaving Du Yu alone in front of the class door, he adjusted his clothes and then knocked on the door.


    ??


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