单项选择题

The board deemed it urgent that these files ______ fight away.

A. had to be printed
B. should have been printed
C. must be printed
D. should be printed
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单项选择题
Even when textbooks are ______ through a school system, methods of teaching may vary greatly.
A. commonplace
B. standardized
C. competitive
D. generalized
单项选择题
If the world is to remain peaceful the utmost effort must be made by nations to limit local ______.
A. collisions
B. combats
C. contradictions
D. conflicts
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