问题
选择题
---Guess what! I have got the highest score in the final exam.
---- Great! You ______ worked very hard and put a lot of energy into it.
A．must
B．must have
C．should
D．should have
答案
答案：B
这题考查 情态动词的用法：must have done“过去一定做”，句意是：--猜怎么了，我在期末考试中获得最高分。--好极了，你一定很努力投入了很多精力。选B。