ThisreturnedChinesescholarhasb

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更新 2022-09-03
科目英语
题型单选题
难度较易
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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 on wild animals for eight years.

A．has worked	B．had worked
C．worked	D．has been working

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