【正确答案】 A

【答案解析】[解析] 约翰为流行音乐而疯狂。句中crazy：疯狂的。mad：发疯的，如：She went mad after the death of her son．儿子死后她就疯了。sorry：抱歉的，难过的，如：I was sorry to hear that your cat had died．听说你的猫死了，我觉得很难过。concerned：关心的，忧虑的，如：She is concerned about your safety．她不放心你的安全。worried：担心的，如：People are becoming increasingly worried about pollution．人们对污染越来越感到忧虑。只有mad意思上和crazy最接近。