____ in the United States, St Louis has now become the 4th largest city.
A．It is the 24th biggest city
B．It was the 24th biggest city
C．Before the 24th biggest city
D．Once the 24th biggest city
D

試題分析：句意：那是St Louis是美國排名第24的大城市，而如今它已成為排名第4的大城市。句子中間用逗號隔開，說明整個就是一個句子，那就不能存在兩個謂語，除非其中一個是從句，所以去掉A、B兩個答案，再根據(jù)句意，故選D。
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