单选题 The economy in this region has been stagnant for a long time and no signs of recovery have ______ till now.
【正确答案】 A
【答案解析】(show up露出，显出)。句意为：长期以来，该地区的经济十分萧条，经济复苏的迹象尚未显露出来。B．keep up维持；C．pick up无师自通地学会(语言)；D．make for有利于。