单项选择题

The students are staying up late these days ______ for the final exams.

A. to preparing
B. to prepare
C. being prepared
D. prepared
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单项选择题
Mary and John ______ each other since childhood.
A. have been knowing
B. knew
C. have known
D. had known
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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