单项选择题

A．The food spoiled.
B．The group was shameful.
C．The weather was bad.
D．The program director wanted to have it on another day.
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单项选择题
One of the reasons why the long-term trend of prices has been downwards is that ____________.
A．technological innovation can promote social stability
B．political instability will cause consumption to drop
C．new fanning and crop technology can lead to overproduction
D．new sources are always becoming available
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