---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
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B解析这题考查 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。