题目内容

Mary’s score on the test is the highest in her class；she_______ have studied very hard．

A．must B．may C．should D．ought to

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—Mary’s score on the test is the highest in her class.
—Really? She have studied very hard.

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

---Really? She ______ have studied very hard.

A. may B. ought to C. must D. should

—Mary’s score on the test is the highest in her class.—Really? She have studied very hard.