【题目】––I think the paper is taking you a long time to write.
––I ________ on it for almost a month now.
A. worked B. was working C. am working D. have been working
在线课程【答案】D
【解析】考查时态。上句：我想写这篇论文要花你很长时间。下句：我写了差不多一个月了。写论文这个动作从过去某一时间开始，一直持续到现在，根据语境，可能仍然要继续下去，所以要用现在完成进行时，故答案为D。