—Mary’s score on the test is the highest in her class.
—Really? She     have studied very hard.
A．mayB．ought toC．mustD．should
C
考查情態(tài)動詞表示推測。Must have done一定做了某事；B=D，所以排除。May have done也許做了某事；句意：—Mary的考試分?jǐn)?shù)是班級里最高的�！娴膯幔克隙▽W(xué)習(xí)的非常認(rèn)真。
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