____ winter is still with us, and will be for a few more weeks, warm days may still be in the forecast for

your area. [ ]

A. As long as

B. Even though

C. Now that

D. Ever since

环境管理体系的运行模式，遵守由查理斯?德明提供的规划策划(PIAN)、实施(DO)、验证(CHECK)和改进(ACTIoN)运行模式可简称PDCA模式。