单选题 They ignored him, despite his repeated ______ that he was not on the scene of murder that evening.

【正确答案】 C

【答案解析】[解析] 各项的意思是：assumption“假定，臆断”；supposition“猜测，猜想”；affirmation“确定，认定”；confirmation“证实，(基督教中的)坚信礼”，根据句意判断，答案是C。