单选题
Why did the man fasten the end of the rope before he climbed up the ladder?
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.
【正确答案】
D
【答案解析】
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