We must stop ( ) our river.A.the pollution of B.pollution C.the pollutions of D.pollutions with选什么,

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Wemuststop()ourriver.A.thepollutionofB.pollutionC.thepollutionsofD.pollutionswith选什么,Wemuststop()our

We must stop ( ) our river.A.the pollution of B.pollution C.the pollutions of D.pollutions with选什么,
We must stop ( ) our river.A.the pollution of B.pollution C.the pollutions of D.pollutions with
选什么,

We must stop ( ) our river.A.the pollution of B.pollution C.the pollutions of D.pollutions with选什么,
A