Mark _________ in China for 10 years and now he teaches Chin

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Mark _________ in China for 10 years and now he teaches Chinese in Britain.
A.has worked B.worked C.had worked D.is working

我跟楼上意见不同,我觉得选B.因为 now he teaches Chinese in Britain,说明现在已经不在China,不能用现在完成时,而要用过去式.
为何不选C呢?过去完成时had done 只能用在特定的语境,是不能单独使用的.如：The plane had taken off when Tom got to the airport..与 got to the airport 这个动作比较,taken off 动作发生在前面,故用过去完成时taken off.

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