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【题目】 ______ around the clock for two days,David managed to finish the report for the manager on schedule.

A. Working B. Worked

C. Having worked D. To work

【答案】C

【解析】

试题分析:考查非谓语动词。本句考查非谓语动词担当状语。在担当状语时,需要和主句主语之间存在一定的逻辑关系本句主语为David,和动词work之间存在主动发出的关系。故选B错误。再根据主句句意:David按时为经理完成了报告。可知,在完成报告之前,他日以继夜地工作了两天,故选择C,表在主句谓语动词之前发生。

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