单选题 Any Democratic president will try to ______ the United States from the mess in Iraq, yet all would face rigid constraints.
A. knockout B. distinguish C. overture D. extricate

【正确答案】 D
【答案解析】[解析] knockout“击昏，击倒”；distinguish“区别，辨别”；overture“建议”；extricate “使摆脱，解救”。