【单选题】Passage Two There was a big pile of bricks on the top of a tall building and a man had to bring them down to the ground. He had a long rope which went over a pulley(滑轮) at the roof of the building. Th...
A.
He was afraid that someone would steal his box.
B.
Because he wanted to climb up along the rope.
C.
He fastened the end of the rope in order to keep the box unmoved.
D.
Because he wanted to prevent the box from coming down.