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