It's clear that the number of cars on the roads ______ rising with the development of the society.[ ]

A. keeps          

B. were keeping        

C. was keeping        

D. keep

《重大外来林业有害生物灾害应急预案》中明确，监测机构的责任，规定县级（含县级）以上各级森林病虫害防治检疫机构为（）单位，负责组织实施（）工作。