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】各项的意思是:assumptions假定,臆断;suppositions猜测,猜想;affirmations确定,认定;confirmations证实,(基督教中的)坚信礼。根据句意判断,答案是C。