单项选择题

Delaying the problem too long won't help ______ it.

A．solving
B．solve
C．to solve
D．solves
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单项选择题
Scientists say that many factors ______ great changes in the weather.
A．brought about
B．brought on
C．brought up
D．brought forward
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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