单项选择题

A．hanging up
B．hanging on
C．putting up
D．putting on
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单项选择题
A．A code number.B．An agent.C．An airliner.D．A heavy bomber.
A．A code number.
B．An agent.
C．An airliner.
D．A heavy bomber.
单项选择题
The idea of a balanced diet is very difficult to ______ to anyone who knows nothing about food values.
A．put through
B．put across
C．put down
D．put up
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