单选题 An animator has to build up his or her work frame by frame. Each film takes a very long time to make, and so ______ are essential to see the project through to the end.
【正确答案】 D
【答案解析】[解析] 句意：漫画家要逐个地构建作品，每一部电影都要花上很多时间来制作，因此献身和投入是将工程进行到底的关键。dedication献身，贡献，commitment委托事项，许诺，承担义务。see...through将…进行到底。continuity连续性。relaxation松弛，放松，减轻。diversions转向，转移。