_____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 working
C、Have worked
D、Worked

答案A

解析 work所表示的动作，是由句子的大主语发出的，而且早于become这个动作，表示主动和完成，用现在分词的having done形式。

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英语

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