单选题Although their new factor

问题补充：

单选题Althoughtheirnewfactorybuildingisstillunder________construction,wehavealreadyplaced_______orderfor200pairsofshoes.A.the ; anB.a; anC./; /D./; an

答案：

D解析考查固定搭配。Be under construction在建设中；place an order订购，下订单。所以选D。