专家们建议污水净化以后才能排入河流、湖泊。
A.The experts suggested that polluted water should be made clean before it was poured into the rivers and lakes. B.The experts suggested that polluted water is make clean before it was poured into the rivers and lakes. C.The experts suggested that polluted water should making clean after it was poured into the rivers and lakes.正确答案A
