单选题 It is laid down in the regulations that all members must carry their membership cards at all times.
A. suggested B. warned C. stated D. confirmed

【正确答案】 C

【答案解析】lay down是个短语，除了按其字面意思可以解释为“放下”外，还可以解释为“规定、写下”，本句中用的是它的被动形式。全句的意思是：规章里写明，所有会员随时都要携带会员卡。