单选题 It is laid down in the regulations that all members must carry their membership cards at all times.
【正确答案】 C
【答案解析】[解析] 题干大意：这是本条例的规定，所有成员必须时刻随身携带会员证。画线词laid down：主张，规定，选项中state：主张，故答案选C。