单项选择题

The board deemed it urgent that these files ______right 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
I don't know you want to keep the letter. I've ______ it up.
A. cracked
B. torn
C. broken
D. disposed
单项选择题
When it was my turn to introduce myself, I was so nervous that my mind went ______.
A. blank
B. faint
C. vain
D. dim'
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