(2013·甘肃兰州、靖远名校高三模拟)Social practice is an opportunity for students to gain________better understanding of how________society operates.
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A
the;the 
B
the;/
C
a;/ 
D
the;a
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Many students_______ from the new library since it was open to all.
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A
benefited
B
were benefited
C
have been benefited
D
have benefited
-- Dear me! I _____ you at first sight! But you do have changed a lot!  -- Nor _____ I! You are no longer the Fat Girl! 
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A
haven’t recognized; have
B
hadn’t recognized; had
C
don’t recognize; do
D
didn’t recognize; did