单项选择题

There was a heavy fog this morning, so none of the planes could _________.

A．get through
B．take off
C．pull out
D．break away
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单项选择题
The villagers have offered much help to us and we think we should do something for them_________.
A．in return
B．in place
C．in fashion
D．in danger
单项选择题
It''s reported that the police are _______the area for the criminal(罪犯).
A．processing
B．operating
C．searching
D．handling
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