Question

【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

Answer 1

【答案】D
【解析】句意：工作了两天，Steve成功的按时完成了她的报告。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。