______ around the clock for two days，David managed to finish the report for the manager on schedule....
2022-11-06 01:03:58 199次 2014-2015学年安徽安庆五校联盟高三下3月联考英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
______ around the clock for two days，David managed to finish the report for the manager on schedule.
A. Working B. Worked
C. Having worked D. To work
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