_______ in the company for three years, Mark has become experienced in business negotiations. A) Having worked B) Have been working C) Have worked D) Worked

_______ in the company for three years, Mark has become experienced in business negotiations.
A)
Having worked
B)
Have been working
C)
Have worked
D)
Worked

出自：华北水利水电大学-水利水电建筑工程-大学英语2

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