中国的汽车工业发展的三大阶段:1956年-1984年____阶段;1984年-1997年____阶段;1997年至今____阶段;

downI cn’t spell their nmes, could you plese _____ write it down B．write down it C．write them down D．write down themA．write it downB．write down itC．write them downD．write down them