________ in the company for three years, Mark has become experienced in business negotiations. ( 章节：1 难度：2)
- A、Having worked
- B、Have been working
- C、Have worked
- D、Worked
正确答案:A
答案解析:有
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________ in the company for three years, Mark has become experienced in business negotiations. ( 章节：1 难度：2)
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