单选题 All that may come to my knowledge in the exercise of my profession or in daily commerce with men, which ought not to be spread abroad, I will keep secret and will never reveal.
A. business B. exchange C. wedlock D. contact

【正确答案】 D

【答案解析】[解析] commerce意为“交往，社交”。D选项：contact意为“联络，交往”，与画线的单词意义相符，如：Farm workers frequently come in contact with these insecticides．(农场工人常常接触这些杀虫剂。)句意：对于在执业或日常与人交往时不应公开的所见所闻，我会保守秘密，绝不泄露。故选D。A选项：business交易，行业，业务；B选项：exchange交换，交流；C选项：wedlock婚姻。