【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
在线课程【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.