单项选择题

The mail was delayed for two days because of the snow-storm.

A．held in
B．held up
C．held down
D．held off
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单项选择题
It is seldom acceptable to abbreviate words in formal writing.
A．omit
B．explain
C．invent
D．shorten
单项选择题
While attempting to find a new route to India, Columbus discovered America by accident.
A．sailing
B．failing
C．trying
D．hoping
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