请教一道英语题(英语不错的进)Mary's score on the test is the highest in her class,she___have studied very hard.A.may B.must C.should D.ought to

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请教一道英语题(英语不错的进)Mary's score on the test is the highest in her class,she___have studied very hard.A.may B.must C.should D.ought to

请教一道英语题(英语不错的进)Mary's score on the test is the highest in her class,she___have studied very hard.A.may B.must C.should D.ought to
请教一道英语题(英语不错的进)
Mary's score on the test is the highest in her class,she___have studied very hard.
A.may B.must C.should D.ought to

请教一道英语题(英语不错的进)Mary's score on the test is the highest in her class,she___have studied very hard.A.may B.must C.should D.ought to
B
这次考试,Mary的分数是全班最高的,她一定努力学习了.
此处的must表示猜测、推测.