单项选择题

If uncontrolled, the shortage would ______ a new upsurge in meat prices.

A．set back
B．set forward
C．set off
D．set up
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单项选择题
I am always ______ of anyone who wants to sell me something on the cheap.
A．suspect
B．suspecting
C．suspicious
D．susceptible
单项选择题
The footsteps of thousands of visitors had ______ the steps.
A．worn on
B．worn off
C．worn out
D．worn away
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