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

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单项选择题
Sometimes it is advisable to book hotels in advance.()

A. possible
B. profitable
C. easy
D. wise
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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