问题
选择题
--- 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
答案
答案：C
题目分析： 情态动词表肯定推测。题意，猜猜看，我得了A。 棒极，人肯定付出很多努力。根据上句中have done 得了事情已经发生，所以表示对过去的肯定推测，用must have done .故选 C项。
考点 情态动词