题目内容：
_______ 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
参考答案：
选择题：_______ in the company for three years, Mark has b
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- 题目类型：选择题
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A)
Having worked
B)
Have been working
C)
Have worked
D)
Worked