Question

there used to be a shoe factory over there,usedn't there?

Answer 1

绝对正确

used 的 否定形式 就是 直接加not 也就是 usedn't

there used to be.曾经有.

there usedn't to be .不曾有.

反义疑问句 根据前肯后否 的原则

就是 there used to be.,usedn't there?

当然用 didn‘t there?也是对的.

但绝不能 用wasn't there?

如果 选项 是 didn't it 和 usedn't there.绝对选后者.因为前者用it不对.