the task in time we had to work late into the night.A. FinishedB. FinishingC. To finish

问题补充：

the task in time, we had to work late into the night.

A. Finished

B. Finishing

C. To finish

D. Having finished

答案：

A. Finished

B. Finishing

(答案→)C. To finish

D. Having finished

解析：句意：为了及时完成这项任务，我们不得不工作到深夜。表示将来的事情，故用不定式作目的状语，选C。