问题
选择题
---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
答案
答案：C
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---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
答案：C