—Guess what ! I have got A for my term paper .
—Great ! You read widely and put a lot of work into it .
A. should
B. should have
C. must
D. must have
网友回答
A. should
B. should have
C. must
(答案→)D. must have
解析：考查情态动词， must have done 表是对过去事情肯定的推测，句意：猜怎么了？我在这学期的考试中得了A，太棒了！你一定大量的阅读为考试投入了大量的工作，故选D。