Question

一个there used to There used to be lots of trees,_____?A.weren

Answer 1

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 lots of old city walls in beijing, usedn't there?

You used to smoke a pipe, use(d)n’t / didn’t you?

所以应该选C