(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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By the time you get to Beijing tomorrow, I ______ for Shanghai.
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A
am leaving
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should have left
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She won the first prize;though none of us   it.
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A
expected
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—When did you come back? —Half an hour ago. You ____ to music.
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A
have been listening
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were listening
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had listened
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listened