单项选择题

The economy in this region has been stagnant for a long time and no signs of recovery have ______ till now.

A．shown up
B．kept up
C．picked up
D．made for
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单项选择题
Doctors in this hospital have successfully ______ 100 surgical treatments to remedy those suffering nearsightedness.
A．illuminated
B．plunged
C．administered
D．specified
单项选择题
The frequent ______ from cold to warm weather this spring have caused much illness.
A．transmissions
B．transactions
C．transformations
D．transitions
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