help!help!The paper factory ______(be）open for 2 years ,it's polluted many rivers.
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help!help!Thepaperfactory______(be）openfor2years,it''spollutedmanyrivers.help!help!Thepaperfactory___
help!help!The paper factory ______(be）open for 2 years ,it's polluted many rivers.
help!help!The paper factory ______(be）open for 2 years ,it's polluted many rivers.
help!help!The paper factory ______(be）open for 2 years ,it's polluted many rivers.
has been
have been
楼上 正答。