一个there used to

题目

一个there used to
There used to be lots of trees,_____?
A.weren't there.B.were there.C.didn't there.
这题我问过老师,竟然选A,而我看的资料上是C,用有道翻译一下却又是B也可以,这咋办?

答案

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