________the project in time , the staff were working at ween

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________the project in time , the staff were working at weenkends.
A. Competing B. Having completed C. To have completed D. To complete
【答案】D
C为啥不对?
有“不定式做目的状语,和主句时态没有关系”这一说法吗?

肯定不能用to have completed 这个不定式的完成式,因为这一形式表示不定式的动作先于谓语动词（这句是：were working) 发生.显然不对
这句指的是“员工们在周末工作,为的就是及时完成这个工程”,指的是谓语动词所表动作之后的事,可见应该用一般式
可以说,作目的状语,不定式一般用一般式,因为指的是谓语动作以后的事.

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