—Mary’s score on the test is the highest in her class.

—Really? She     have studied very hard.


  1. A.
    may
  2. B.
    ought to
  3. C.
    must
  4. D.
    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的考試分數(shù)是班級里最高的。—真的嗎？她肯定學習的非常認真。
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