advantages and disadvantages, Mr. Smith decided to leave the company and go to the west

网友回答

A. Having pared
(答案→)B. Having balanced
C. Having observed
D. Having examined
解析：考查非谓语动词以及词义辨析。句意：权衡利弊之后史密斯先生决定离开公司去西部淘金。Compare 比较， balance 权衡， observe 观察，examine 检查，现在分词的完成式表示分词动作发生在谓语动作之前且与句子主语为主谓关系。故选B