Mr. Bob, ______ as a manager for many years, found it hard to be an ordinary clerk again.
A．having workedB．workedC．to have workedD．working
A

試題分析：考查現(xiàn)在分詞的完成式做狀語：句意：做經(jīng)理很多年后，鮑勃先生發(fā)現(xiàn)很難做一個普通的職員了。根據(jù)句意，鮑勃先生是先做經(jīng)理，然后才發(fā)現(xiàn)做秘書難的，當狀語的動作發(fā)生在主句的動作之前，用現(xiàn)在分詞的完成式做狀語，選A。
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