Question

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

   A. Completing   B. Having completed

   C. To have completed   D. To complete

Answer 1

4. D

4. D解析：句意：为了及时完成任务，全体员T周末都在丁-作。to complete作因 的状语，符合题意。现在分词一般不作 目的状语，排除A项；B、C两项表示的 动作都发生在谓语动词动作之前。