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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单项选择题
The student did his homework ______ his professor had assigned.
A．when
B．as
C．until
D．if
单项选择题
He saw the only lighted window on the third floor ______ black.
A．go
B．went
C．to go
D．gone
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