单项选择题

In the north, the price of fresh vegetables ______ seasonally.

A．alters
B．converts
C．fluctuates
D．modifies
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单项选择题
The old farmer was run down by a car. He was taken to the hospital and ______ on by the chief surgeon right now.
A．operated
B．having been operated
C．is operated
D．is being operated
单项选择题
Some companies have introduced flexible working time with less emphasis on pressure ______.
A．than more on efficiency
B．but more efficiency
C．but more on efficiency
D．than more efficiency
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