问题补充：
Some buildings built in the past down and new ones are being built there.
A. will be pulled
B. had been pulled
C. have been pulled
D. are pulling
答案：
A. will be pulled
B. had been pulled
(答案→)C. have been pulled
D. are pulling
解析：考查时态。句意：在过去一些建筑物已经被拆毁了，在那新的建筑物正在被建起。根据语境动作时从过去一直持续到现在，所以用现在完成时态。故选C。
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