单项选择题

What do we know about the flight

A．There will be a short delay.
B．There will be a long delay.
C．The flight has been cancelled.
D．The condition is still uncertain.
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单项选择题
________has contributed most to the redwoods survival.
A．Absence of natural enemies
B．Resistant bark and damp climate
C．Coastal isolation
D．Cool weather and daily fog
单项选择题
Weeks ______ before anyone was arrested in connection with the bank robbery.
A．elapsed
B．expired
C．overlapped
D．terminated
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