问题补充：
—Guess what？ I have got A for my term paper.
—Great!You read widely and put a lot of work into it.
A. must have
B. should
C. must
D. should have
答案：
(答案→)A. must have
B. should
C. must
D. should have
解析：试题分析:上文意思,猜猜看，我在学期报告中得了一个A。下文意思，真棒！你一定是阅读广泛并且你付出了很多劳动。 must have done表示对过去发生的事情或状态进行推测，语气比较肯定，通常只用于肯定句.Should应该，must必须should have done表示过去本应该做的事却没做。故选A.
