贺胜为何能得到忽必烈的提拔？
贺胜因救驾有功，被忽必烈提拔为上都留守。[{'character': '贺', 'pinyin': 'he4', 'highest pitch': 13.19, 'lowest pitch': 9.38, 'duration': 0.28, 'prosody hierarchy': 'null'}, {'character': '胜', 'pinyin': 'sheng4', 'highest pitch': 11.17, 'lowest pitch': 7.01, 'duration': 0.36, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.11}, {'character': '因', 'pinyin': 'in1', 'highest pitch': 8.71, 'lowest pitch': 8.3, 'duration': 0.23, 'prosody hierarchy': '#1'}, {'character': '救', 'pinyin': 'jiou4', 'highest pitch': 9.95, 'lowest pitch': 8.35, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '驾', 'pinyin': 'jia4', 'highest pitch': 8.9, 'lowest pitch': 6.58, 'duration': 0.19, 'prosody hierarchy': '#1'}, {'character': '有', 'pinyin': 'iou3', 'highest pitch': 6.58, 'lowest pitch': 3.35, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '功', 'pinyin': 'gong1', 'highest pitch': 8.88, 'lowest pitch': 7.32, 'duration': 0.28, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.28}, {'character': '被', 'pinyin': 'bei4', 'highest pitch': 8.98, 'lowest pitch': 7.32, 'duration': 0.22, 'prosody hierarchy': '#1'}, {'character': '忽', 'pinyin': 'hu1', 'highest pitch': 10.67, 'lowest pitch': 7.39, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '必', 'pinyin': 'bi4', 'highest pitch': 10.49, 'lowest pitch': 9.02, 'duration': 0.15, 'prosody hierarchy': 'null'}, {'character': '烈', 'pinyin': 'lie4', 'highest pitch': 10.5, 'lowest pitch': 6.94, 'duration': 0.27, 'prosody hierarchy': '#2'}, {'character': '提', 'pinyin': 'ti2', 'highest pitch': 7.8, 'lowest pitch': 6.78, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '拔', 'pinyin': 'ba2', 'highest pitch': 7.91, 'lowest pitch': 6.64, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '为', 'pinyin': 'uei2', 'highest pitch': 7.36, 'lowest pitch': 6.01, 'duration': 0.21, 'prosody hierarchy': '#2'}, {'character': '上', 'pinyin': 'shang4', 'highest pitch': 10.42, 'lowest pitch': 7.36, 'duration': 0.27, 'prosody hierarchy': 'null'}, {'character': '都', 'pinyin': 'du1', 'highest pitch': 10.47, 'lowest pitch': 8.43, 'duration': 0.14, 'prosody hierarchy': '#1'}, {'character': '留', 'pinyin': 'liou2', 'highest pitch': 10.21, 'lowest pitch': 7.08, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '守', 'pinyin': 'shou3', 'highest pitch': 10.21, 'lowest pitch': 0.84, 'duration': 0.3, 'prosody hierarchy': '#4'}]