单项选择题

The government has ______ a committee to investigate this matter in local elections.

A．set ont
B．set to
C．set up
D．set about
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单项选择题
______ by the explosion, we all rushed out of the hall.
A．Frighten
B．Frightened
C．Frightening
D．To frighten
单项选择题
Since the introduction of the new technique, the production cost ______ greatly.
A．reduces
B．is reduced
C．is reducing
D．has been reduced
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