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    — This returned scientist has become one of the top experts in his field. 
    — Yes, I know him very well. He once _____ in South America with wild animals for eight years.

    A. has worked
    B. worked
    C. had worked
    D. has been working
    B
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    科目：高中英语 来源：0111 期中题 题型：单选题

    — This returned scientist has become one of the top experts in his field. 
    — Yes, I know him very well. He once _____ in South America with wild animals for eight years.
    [     ]
    A. has worked
    B. worked
    C. had worked
    D. has been working

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