单项选择题

It is seldom acceptable to abbreviate words in formal writing.

A．omit
B．explain
C．invent
D．shorten
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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
单项选择题
The immense change of the city astonished every member of the conference.
A．surprised
B．interested
C．bored
D．excited
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