Bhind the factory there used to (1 )much waste,( 2 1 have还是be ,2 usedn't it还是 usedn't there

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Bhind the factory there used to (1 )much waste,( 2 1 have还是be ,2 usedn't it还是 usedn't there
Bhind the factory there used to (1 )much waste,( 2 1 have还是be ,2 usedn't it还是 usedn't there

Bhind the factory there used to (1 )much waste,( 2 1 have还是be ,2 usedn't it还是 usedn't there
Behind the factory there used to 【be】much waste,【usedn't there】?

be
这是there be 句型,表示某地存在某物,
usedn't there,对there be 提问,吧there 看成主语