单项选择题

Hip replacement surgery is______joint replacement surgery in the U.S..

A．the single most frequent
B．the most single frequent
C．the single frequent
D．a single frequent
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单项选择题
The major obstacle to the reform in New Orleans, ______, is money.
A．as is it across the country
B．as it is across the country
C．as it were across the country
D．as were it across the country
单项选择题
A______, he was probably one of the most realistic writers of his day.
A．self-confessing romantic
B．self-confessed romance
C．self-confessing romance
D．self-confessed romantic
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