She told me her insurance company needed a capable leader, with strong will as well as go

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A. who
B. that
(答案→)C. one
D. which
解析：考查代词：句意：她告诉我她的保险公司需要一个有能力的领导，一个有坚强意志而且幽默的领导。这里需要一个代词指代a lead，做a capable leader的同位语，one可以泛指前面的可数名词单数，who和which引导的是定语从句，that特指不可数名词和可数名词的单数，选C。