Has James finished his report on his Enquiry Learning yet?\-- I’m not sure. He on

问题补充：

--- Has James finished his report on his Enquiry Learning yet?\

---- I’m not sure. He on it last week.

A. was working

B. has worked

C. worked

D. had worked

答案：

(答案→)A. was working

B. has worked

C. worked

D. had worked

解析：句意为：----James完成了他有关咨询式学习的报告了吗？ ----我也不知道，上周他一直在从事这个工作。has done现在完成时，过去发生的动作对现在造成的影响，句意中是没有此含义的，过去发生的动作一直持续到现在，题目中也没有此意，故可排除B；worked强调过去的动作，此题目表示的是过去的一周一直在做的事情；had done过去完成时，表示过去之过去，work这一动作没有发生在过去的动作之前。