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-----This returned Chinese scholar has become one of the top experts in this fie

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-----This returned Chinese scholar has become one of the top experts in this fie

-----This returned Chinese scholar has become one of the top experts in this field.

-----Yes, I know him very well. He _____ in Africa with wild animals for eight years.

A.is workingB.had workedC.workedD.has been working

试题答案

C

解析