【正确答案】In order to get along well with others，you should have the perfect ability in which you deal with interpersonal relationship．

【答案解析】本句的动词“保持”“具备”“处理”，根据动词拆成三个小分句；后半句中存在一个“的”字句：
为了保持良好的关系与他人，(用不定式表示目的状语成分)in order to get along well with others．你应该具备优秀的能力。You should have the perfect ability／competence．
用这种能力你处理人际关系。In this ability you deal with interpersonal relationship．