-----Guess what! I’ve passed my oral English test and got A.
----- congratulations. You practiced a lot.
A. must have B. should have C. must D. should
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解析：考察情态动词用法。Must have done是对过去所发生情况的肯定推测，意为：一定做了…;should have done本应该做某事，实际上却没有做；根据上下文可知A正确。句意：—猜猜看！我通过了口语考试，并得了一个A。—祝贺你！你一定做了大量的练习。