There used to be a timple on the hill 怎样变反意疑问句

There used to be a timple on the hill,didn't there?如果陈述句部分的谓语含有used to,其反问部分既可用use(d)n’t,也可用didn’t.例如：There used to be some trees in this field,use(d)n’t / didn’t there?Y...