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。