单项选择题

Mary and John ______ each other since childhood.

A. have been knowing
B. knew
C. have known
D. had known
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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
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
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