the project along with the experiment we had once devoted so much time_____perfectly
问题描述：
the project along 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
请详细说明为什么
答
据句意得：我们多次为这项目投票是为了它更完美—to do sth.不定式表目的