单项选择题

Every minute must be made full use ______ at the preparations for the exams.

A．of to work
B．of work
C．of working
D．to working
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单项选择题
My friend had no ______ of helping the man who was acting too rudely.
A．ambition
B．desire
C．willingness
D．intention
单项选择题
To some extent, the principle of secrecy has been ______.
A．maintained
B．held
C．observed
D．implemented
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