Bob has learned a lot from his of working in different gyms and is now an expert on all k

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A. experience; equipment
B. experience; equipments
(答案→)C. experiences; equipment
D. experiences; equipments
解析：考查名词的单复数。Experience当经验讲时，是不可数名词，无复数；当经历讲时，是可数名词，有复数；根据句意，鲍勃是从在不同体育场馆工作的经历中学到了很多，experience在这有复数形式，排除A,B；equipment设备，装备，为不可数名词，无复数，所以选C。