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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It was in that small village ______ our president was born.
A．which
B．when
C．that
D．as
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By the time he arrives in Beijing, we ______ here for two days.
A．will have stayed
B．shall stay
C．have been staying
D．have stayed
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