单选题 He was on the point of slipping down the slope when he heard someone shouting to him to ______the rope.
【正确答案】 A
【答案解析】hang on“紧握着不撒手；坚持下去”；hang up“(电话)挂断”；hang about“闲逛；聚在……附近”；hang around＝hang about。