单项选择题

Mary's score on the test is the highest in her class; she ______ have studied very hard.

A．may
B．should
C．must
D．ought to
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In which Chinese city is Mr. Dong’s university located
A． Beijing.
B． Shanghai.
C． Guangzhou
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American cigarette sales are expected to decrease by ______ by the end of the decade.
A． 15%
B． 20%
C． 30%
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