一个there used to

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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?

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
再问：为何老师说这是there be结构，又因为后面的lots of trees，所以说选A呢？
再答： 'used to' 的主语通常是人称代（名）词（如she， they，Lily等），如用表示事（物）的名词作主语，习惯上通常使用“there used to be．．．”结构。例如： There used to be a bus stop on that corner, didn't there? 那个拐角处过去有个公共汽车站,不是吗? “used to”所表示的“过去”含义常有明显的与现在对照的意思，即“过去常这样做，现在不这样做了”。虽然这里是there be 句型，但是used 在这里是实意动词，所以应该用didn't there?

一个there used to there be 和used to 英语.there used to be There ___ a museum here. A.used to B.used to do C.used to ha There used to be反意疑问句 there be句型用 used to 请问 There used to be a park. there used to be a church here ,----? There used to ___no school here there used to be的意思! there used to be 一般疑问句是used there to be There used to be a clean river.为什么不是There used to have a cle