单项选择题

The police ran ______ all possible leads in the case.

A．in
B．up
C．against
D．down
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单项选择题
A ______ of small glittering fish swam by.
A．pack
B．swarm
C．flock
D．school
单项选择题
Mortgages are hard to come ______ since banks are more cautious.
A．with
B．in
C．by
D．through
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