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
The feeling of loneliness which can ______ you when you are in a crowd is very difficult to get rid of.
A．overcome
B．defeat
C．beat up
D．creep over
单项选择题
If you know ______ , you will have a job. If you know why, you will be the boss.
A．how
B．when
C．what
D．if
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