Question

【题目】The project alongside with the experiment we had once devoted so much time __________ perfectly.

A. to work out B. to working out

C. to worked out D. has worked out

Answer 1

【答案】C

【解析】句意：该项目让我们曾经花了这么多时间实验，效果很好。we had once devoted so much time to 定语从句，修饰先行词the project, worked out为主句的谓语。