________the project in time, the staff were workii.g at weekends.

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问题 ________the project in time, the staff were workii.g at weekends.

选项 A、Completing
B、Having completed
C、To have completed
D、To complete

答案D

解析 根据主结构:周末一直在工作,可知是为了按时完成工程,属未发生要发生的动作,故选To complete作目的状语。
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