句子分析：Little has been done to prevent the air from being poll

句子分析：Little has been done to prevent the air from being poll ( )has been done to prevent the water in the lake from being ____ has been done to prevent the water in the lake from bei Little___done to prevent the air from being polluted. 4.Little has been done is helpful to our work. prevent from being ___is done to clean the air.为什么填little不填a little In some place( ) has been done to stop air pollution and wat i think that something has to be done to stop our air from b 详细分析句子并翻译原句Reserch has also been done into the way people's something must be done to prevent some students from froping The air has been contaminated by the smoke from the ______ f