____ has been done to prevent the water in the lake from bei

____ has been done to prevent the water in the lake from bei ( )has been done to prevent the water in the lake from being 句子分析：Little has been done to prevent the air from being poll It was said that something (do)to prevent the water from bei 现在完成时The government has done a lot to protect the water from Every means ----prevent the water from -----. We must try our best to prevent the lake from pollution. ____ has recently been done to provide more buses for the pe 第十三讲 宾语从句5.____ has recently been done to improve the taxi s Dongting Lake is the ____(one) largest fresh water lake in C In what ways has water been important to the UK and how the What ____ with the clothes?A.has been done B.has done C.have