单项选择题

______ by the explosion, we all rushed out of the hall.

A．Frighten
B．Frightened
C．Frightening
D．To frighten
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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
单项选择题
It's necessary that the problem ______ in some way or other.
A．is settled
B．was settled
C．be settled
D．has been settled
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