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    精英家教网 > 高中英语 > 题目详情
    ----This returned Chinese scholar has become one of the top experts in this field.
    ----Yes,I know him very well.He____in Africa with animals for eight years.
    A．has workeB．had workedC．workedD．has been working
    C
    since，for作为连词，引导时间状语（从句）如果谓语动词是延续性的一般过去时，其表达的含义是"从这个动作结束以来"，恰好和动词的词义相反，具有否定的含义；如果谓语动词是非延续性的一般过去时，其表达的含义是"从这个动作开始以来"，恰好和动词的词义一致，具有肯定的含义
    It is 3 years since her husband worked as a news journalist. 她丈夫不当记者已三年了。
    It is 5 years since I joined the army. 我在部队已服役五年了。（仍在军队服役）
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