Employers often give jobs to they believe has work experience and a stong sense of duty.A

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(答案→)A. whoever
B. whomever
C. who
D. whom
解析：考查宾语从句：句意：老板经常把工作给他们相信有工作经验和强烈的责任感的人。Whoever引导宾语从句，在宾语从句中whoever做主语，=anyone who，因为在宾语从句中做主语，所以不能用 whomever，who和whom应该引导定语从句，前面缺少先行词，选A。