---This returned Chinese scholar has bee 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 workedB.had workedC.workedD.has been working
网友回答
C解析考生极易受for eight years这一时间状语的干扰，从而选完成时。其实，只要仔细审题，就不难看出这是对一般过去事实的论述。故选C。