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

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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

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
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

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

D 选项中只有used to be的反义疑问是didn't