---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．mustB．must haveC．shouldD．should have
B
這題考查 情態(tài)動詞的用法：must have done“過去一定做”，句意是：--猜怎么了，我在期末考試中獲得最高分。--好極了，你一定很努力投入了很多精力。選B。
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