单项选择题

Working in the library is not his only ______.

A．profession
B．employment
C．prohibition
D．custom
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单项选择题
______ will be given to the doctoral candidates who are registered in their last year of study and who are attending a major professional meeting.
A．Promotion
B．Preference
C．Precaution
D．Priority
单项选择题
Tom' s steps had ______ and there was a moment of absolute silence.
A．died down
B．died from
C．died away
D．died out
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