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    Some buildings built in the past _______ down and new ones are being built there.
    A．will be pulledB．had been pulledC．have been pulledD．are pulling
    C
    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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