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题库 / OG2017V-SC-223
The Baldrick Manufacturing Company has for several years followed a policy aimed at decreasing operating costs and improving the efficiency of its distribution system.
aimed at decreasing operating costs and improving
aimed at the decreasing of operating costs and to improve
aiming at the decreasing of operating costs and improving
the aim of which is the decreasing of operating costs and improving
with the aim to decrease operating costs and to improve
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过去分词做后置定语，因为aim at后面的两个平行的动作都是policy执行的，所以我们可以将aim at前理解为省略了which is,所以是过去分词
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