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
Little ______ that the police are about to arrest him.
A．he knows
B．he doesn't know
C．does he know
D．doesn't he know
单项选择题
Without computer, we ______ great progress in the last decades.
A．would not make
B．will not make
C．could not make
D．should not have made
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