33. (单选题) They went _____ the schedule for the conference again and again until they felt satisfied with every detail of it.(本题2.0分) A、 our B、 up C、 over D、 by

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33. (单选题) They went _____ the schedule for the conference again and again until they felt satisfied with every detail of it.(本题2.0分)
A、 our
B、 up
C、 over
D、 by

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石家庄铁道大学-高等数学下