Little___done to prevent the air from being polluted.

Little___done to prevent the air from being polluted. 句子分析：Little has been done to prevent the air from being poll every means_stop the air from being polluted in that small t ___be done to stop the river from being polluted .A.what do prevent from being ( )has been done to prevent the water in the lake from being The air was polluted by the gas from the factoties.The p____ 选择：Every possible means ( ) to prevent the air pollution we must take some measures to prevent the environment being we should prevent the old trees from being cut down 还是being 英语翻译One way to get rid of the polluted air is to build a car prevent to与 prevent from的区别