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【题目】________in her office for nearly 20 hours, she is going home to have a rest.

A. To work B. Working

C. To have worked D. Having worked

【答案】D

【解析】考查分词。句意:在她的办公室里工作了将近20个小时后,她要回家休息了。逗号之前是句子状语,其中work与其逻辑主语(主句主语)she之间是主动关系,并且根据句子意思可知状语动作发生在主句动作之前,用having done作状语故选D.

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