With a question tag: Everything has been done on how to prevent the pollution,_______?

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问题 With a question tag:
Everything has been done on how to prevent the pollution,_______?

选项

答案hasn’t it

解析当陈述部分的主语是everything，anything，nothing，something等表物的不定代词时，附加疑问部分的主语常用it。答案为hasn’t it。

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