单项选择题

The technological advances made it possible for the middle classes to enjoy what had once been ______ only to the very rich.

A) manageable
B) measurable
C) acceptable
D) affordable
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单项选择题
Doctors warned against chewing tobacco as a______ for smoking.
A) relief
B) revival
C) substitute
D) succession
单项选择题
Tomorrow the mayor is to ______ a group of Canadian businessmen on a tour of the city.
A) coordinate
B) cooperate
C) accompany
D) associate
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