----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作為連詞，引導(dǎo)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(dāng)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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