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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At first ice cream was shaken by ______ hand in ______ pan of salt and ice.
A．a, the
B．the, a
C．/, a
D．the, the
单项选择题
Up ______ when the country declared war on its neighboring country.
A．the oil prices went
B．went the oil prices
C．did the oil prices go
D．would the oil prices go
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