— Did you have trouble with your car this morning?

— Yes, but I finally managed ____. [ ]

A. to get starting it

B. it to get started

C. to get it to start

D. getting started it

丙烯腈结构具有双键和共轭体系，易聚合，聚合产物会使再沸器、塔和管道发生堵塞，影响正常生产。