All possible means ____, but nothing can prevent the buildings ____.
A．has tried; from being pulled down
B．have tried; from pulling down
C．has been tried; from pulling down
D．have been tried; from being pulled down
D
考察主謂一致和prevent的用法。All means謂語(yǔ)動(dòng)詞用復(fù)數(shù)形式，prevent……from doing sth,阻止……干某事
句意為所有的方法都被嘗試過(guò)了，但是什么也阻止不了這些建筑物被推倒。
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