单项选择题

The student did his homework ______ his professor had assigned.

A．when
B．as
C．until
D．if
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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
单项选择题
People tend to complain a lot about the ______ rising prices recently.
A．steeply
B．heavily
C．highly
D．most
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