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----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 worke B、had worked C、worked D、has been working

C


解析:

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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