______ the project in time, the staff were working at weekends.

A. Competing    B. Having completed   C. To have completed  D. To complete

D     


解析:

考查非謂語動詞不定式做目的狀語用法。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時(shí)完成工程，故選D符合。

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