The river and air __(pollute)since the paper factory opened last yearThe river and air 单数还是复数

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The river and air __(pollute)since the paper factory opened last yearThe river and air 单数还是复数
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The river and air __(pollute)since the paper factory opened last yearThe river and air 单数还是复数
The river and air __(pollute)since the paper factory opened last year
The river and air 单数还是复数

The river and air __(pollute)since the paper factory opened last yearThe river and air 单数还是复数
were polluted

是复数
are polluted
有不明白的地方再问哟,祝你学习进步,更上一层楼! (*^__^*)