there--------a tall tree in front of the building over there,didn't there?

问题描述:

there--------a tall tree in front of the building over there,didn't there?
a.was b.would be c.must be d.used to be

.used to be 因为反问句用的是didn't there,因此要选一个过去时,而且谓语动词用实义动词的