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
网友回答
A. to work out
B. to working out
(答案→)C. to worked out
D. has worked out
解析：考查句子结构。主语为The project后面是一个定语从句alongside with the experiment we had once devoted so much time to，to后面缺少宾语故先行词experiment后省略了关系代词which/that，整句话中缺少谓语，根据语境用worked out即The project worked out perfectly.故选C。