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

问题描述:

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】?