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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单项选择题
Prohibition in the United States ushered in an era of crime and corruption.()

A. introduced
B. caused
C. used
D. upset
单项选择题
Vice-President Lyndon Johnson became President of the United States following the death of John F. Kennedy and was subsequently elected to a full term in 1964.
A. duly
B. finally
C. later
D. therefore
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