问题
选择题
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
答案
答案：D
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。