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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作為連詞,引導時間狀語(從句)如果謂語動詞是延續(xù)性的一般過去時,其表達的含義是"從這個動作結(jié)束以來",恰好和動詞的詞義相反,具有否定的含義;如果謂語動詞是非延續(xù)性的一般過去時,其表達的含義是"從這個動作開始以來",恰好和動詞的詞義一致,具有肯定的含義

It is 3 years since her husband worked as a news journalist.  她丈夫不當記者已三年了。

It is 5 years since I joined the army.  我在部隊已服役五年了。(仍在軍隊服役)

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