the project in time, the staff were working at weekends.
A. Competing
B. Having pleted
C. To have pleted
D. To plete
网友回答
A. Competing
B. Having pleted
C. To have pleted
D. To plete
解析：
to plete the project in time为动词不定式作目的状语。A表示正在进行；B表示该动作发生在主句谓语之前；C常用在某些固定句式中。