单项选择题

Bill is an example of a severely disabled person who has become ______ at many survival skills.

A. proficient
B. persistent
C. consistent
D. sufficient
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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
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
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