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【題目】______ for two days, Steve managed to finish his report on schedule.

A. To work B. Worked

C. To be working D. Having worked

【答案】D

【解析】試題分析：句意：工作了兩天，Steve成功的按時完成了他的報告。句中的邏輯主語為Steve，與work之間為主動關系，故用現(xiàn)在分詞，這里用having worked，表示動作的先后性。故選D。

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