单选题 His failure to pay the debts ______ the suspicion that he was not to be trusted.
【正确答案】 D
【答案解析】confirm确定，进一步证实；concern涉及，关系到；confess承认； confuse搞乱，使糊涂。句意为：他没能还债，这就证实了他确实不可信。