泰国佛牌极度危险养小鬼:Up to now air pollution _____(do)great harm to human beings.

Up to now air pollution _____(do)great harm to human beings. just now ,so far , up to now 是什么意思 句中出现up to now用什么时态？ From The First Up To Now什么意思 Now and then ___ up to see what happened. up till now是什么意思？ As I have not receive below list out fabric up to now. 翻译：Now he'll expect me to spend the weekend on my back with my legs in the air over to you now having suffered such heavy pollution already, it may now be too late to clean up the river.