单项选择题

It is not advisable just to ______ without making a timely summing-up of experience.

A．work away
B．work up
C．work out
D．work off
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单项选择题
America holds a slow job growth partly because of ______.
A．the consecutive job loss in manufacturing sector
B．the workers' inadequate skills for the new jobs
C．the high work efficiency of every single worker
D．the machines' replacement by the workers
单项选择题
There is no more delightful ______ than to train those who are eager to learn.
A．profession
B．employment
C．occupation
D．trade
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