his position as mayor to give jobs to his friends，Williams is now under investigationA.

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A. Abused
B. To abuse
(答案→)C. Having abused
D. To have abused
解析：句意：Williams作为市长滥用职权，把工作给他的朋友们，现在正在被调查。“滥用职权”与其逻辑主语“Williams”之间是主动关系，故用现在分词作原因状语，且分词的动作发生在谓语动作之前，故用现在分词的完成时。选C。