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A
Have worked
B
Have been worked
C
Having worked
D
Worked
正确答案 :C
解析
本题考查句法——非谓语动词。
句意:在ABC公司工作四年后,约翰在商务谈判方面已经很有经验了。
C项:Having worked现在分词的完成式。分析句子结构可知,逗号前后都有动词,但句中却无连词连接,说明空格处为非谓语。根据句意可知,逻辑主语John和work(工作)之间是主动关系,故用动词的现在分词形式来表主动。且 “work” 这一动作发生在主句动作 “become” 之前,所以应该用现在分词的完成式。符合题意,故选C。
A、B、D项为干扰选项,故排除。
故本题答案为C。
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