I’ve been working all day, but I feel as if I nothing.
A. have been achieved
B. were achieving
C. had achieved
D. am achieving
网友回答
A. have been achieved
B. were achieving
(答案→)C. had achieved
D. am achieving
解析：考查虚拟语气，此题是与过去相反的虚拟语气，as if 后应用过去完成时态，句意：我整天一直在工作，但是我感觉好像什么也没完成。所以选C。