______ in the company for three years, Mark has become experienced in business negotiations.

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问题 ______ in the company for three years, Mark has become experienced in business negotiations.

选项 A、Having worked
B、Have been worked
C、Have worked
D、Worked

答案A

解析根据"for three years"和主句中的现在完成时态可以推知，此处应该用现在完成时的主动形式。故排除B和D。根据句意可知，空格处所在分句在句中作原因状语，故排除C。因此答案为A。

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