【题目】______ for two days, Steve managed to finish his report on schedule.
A. To work B. Worked
C. To be working D. Having worked
在线课程【答案】D
【解析】试题分析：句意：工作了两天，Steve成功的按时完成了他的报告。句中的逻辑主语为Steve，与work之间为主动关系，故用现在分词，这里用having worked，表示动作的先后性。故选D。
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