(2013·山东烟台市二模)Mr. Johnson, as a manager for many years, found it hard to be an ordinary clerk again.
A. having worked
B. worked
C. to have worked
D. working
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(答案→)A. having worked
B. worked
C. to have worked
D. working
解析:选A 考查非谓语动词。句意:由于已经当经理很多年了,Mr. Johnson发现重新做回一名普通职员很难。主语Mr. Johnson与work之间为逻辑上的主动关系,故应用现在分词形式,由空后的时间状语“for many years”可知,应该用完成式。