单项选择题

In many areas, rapid development is the result of ______ in the research laboratory.

A．work to do
B．work done
C．doing work
D．work doing
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单项选择题
You never get ahead of anyone ______ you try to get even with him.
A．as long as
B．as well as
C．as much as
D．as far as
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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