Widespread wage reductions were imposed during the recession of 1906-1909 and price inflation thereafter impeded the recovery of real wage levels.
 
【正确答案】 C
【答案解析】 动词词义辨析。impede意为“阻止”。选项中只有encumber(阻碍)与之意思相近。故答案为C。convolute“回旋,卷绕”;belie“掩饰”;stock“装把手于……,进货,备有,放牧”。