[讨论]OG SC25 THE VOICE OF THE WORD USE

25. The Baldrick Manufacturing Company has for several years followed a policy aimed at decreasing operating costs and improving．the efficiency of its distribution system．

(A)  aimed at decreasing operating costs and improving 

(B)  aimed at the decreasing of operating costs and to improve

(C)  aiming at the decreasing of operating costs and improving

(D)  the aim of which is the decreasing of operating costs and improving

(E) 
                with the aim to decrease operating costs and to improve

The key is A.

But why using passive voice "aimed". "Policy" is the subject of the verb " aim" .

I have a sence: It is commonplace to exchange " of doing sth" with "to do sth".  Do u think so? 

aim at doing, 是人制定policy才能aim,policy本身不能aim,

排除E是因为 aim  做抽象n.显然没有A的实义动词来的好

I have a sence: It is commonplace to exchange " of doing sth" with "to do sth". 

can you give any example?