问题
单项选择题
（）the project in time, the staff were working at weekends.
A. Competing
B. Having completed
C. To have completed
D. To complete
答案
参考答案：D
解析：
考查非谓语动词不定式做目的状语用法。由后句“the staff were working at weekends.”可知在周末一直在工作的目的就是按时完成工程，故选D符合。