单项选择题

They have been trying to find out the identity of the writer of the ______ letter, but in vain.

A．infamous
B．autonomous
C．anonymous
D．unanimous
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单项选择题
He is totally ______ to other people's attitudes.
A．unconcerned
B．careless
C．indifferent
D．cold
单项选择题
The young painter was very eager to ______ his work, but nobody would 'help him.
A．exhibit
B．display
C．present
D．demonstrate
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