单项选择题

Rescue workers continued the delicate task of sifting through tons of concrete and to try to reach possible survivors.

A．scraps
B．leftovers
C．debris
D．residues
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单项选择题
The taxi ______ in front of a girl just in time to avoid a serious accident.
A．turned in
B．pulled up
C．cleared up
D．dropped in
单项选择题
The president tried to stay in touch with the ambassador ______.
A．at large
B．at hand
C．at a trot
D．at one stroke
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