单选题 A doctor's obligation when he can no longer ______ the approach of death is to make the patient comfortable, including easing his pain.
A. hold back B. hang on C. hang around D. hold on

【正确答案】 A

【答案解析】[解析] hold back“阻止；抑制”；hang around“闲荡；逗留”；hang on“抓紧不放；继续下去”；hold on与hang on同义。