参考答案：A

解析：近义辨析。deny否认，拒绝：She denies any involvement in the robbery．她否认同抢劫案有任何牵连。reject拒绝，抵制，否决，驳回：reject an offer of help拒绝别人提供的帮助。contradict反驳，否认，顶嘴：It's difficult to contradict someone politely．彬彬有礼地驳斥别人是难以做到的。refuse拒绝，谢绝：She refused to help me．她不肯帮助我。