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
网友回答
D解析考察主谓一致和prevent的用法。All means谓语动词用复数形式，prevent……from doing sth,阻止……干某事句意为所有的方法都被尝试过了，但是什么也阻止不了这些建筑物被推倒。