单项选择题

Most people thought that these competitors didn't ______ their prizes because they cheated in the competition.

A．conserve
B．preserve
C．deserve
D．observe
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单项选择题
The city's hall looks magnificent at night when ______.
A．lightened
B．illustrated
C．imitated
D．decorated
单项选择题
These tables showing the ups and downs of the world economy in the 1980's were compiled(汇编) ______ careful observation and detailed studies.
A．at the bottom of
B．in exchange for
C．in the name of
D．on the basis of
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