--- Guess what! I have got A for my term paper.
--- Great! You read widely and put a lot of work into it.
A. must
B. should
C. must have
D. should have
网友回答
A. must
B. should
(答案→)C. must have
D. should have
解析:考查虚拟语气。句意:你猜怎么着!我的学期论文得了个A。——太棒了!你一定做了广发的阅读并投入了大量的工作。本句中read为过去分词,“must+have+done”表示对过去事情的肯定推测,译成“一定做过某事”,故选C。