Question

【题目】__________ the project on time, the staff were working at weekends.

A. Completing

B. Having completed

C. To have completed

D. To complete

Answer 1

【答案】D

【解析】动词不定式短语to complete the project on time作目的状语。A项表示动作正在进行；B项表示该动作发生在谓语动词之前，前两项和C项均不符合题意。句意：为了按时完成这个项目，全体员工周末都在上班。