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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单项选择题
The factory will be fined if the work ______ by the end of the month is delayed.
A. to be completed
B. will be completed
C. being completed
D. completed
单项选择题
I don’t think it advisable that the young man ______ to the important post since he has no practical experience.
A. is appointed
B. will be appointed
C. be appointed
D. has been appointed
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