______ in the United States, St. Louis has now become the 24th largest city.

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问题 ______ in the United States, St. Louis has now become the 24th largest city.

选项 A、The fourth biggest city it was
B、Once the fourth biggest city
C、Being the fourth biggest city
D、It was once the fourth biggest city

答案B

解析 考查主语同位语的用法。从语法上来说,A和D一定是不对的,因为两个句子皆没有连词。选项C表示现在是第四大城市,与句意不符。once表示“曾经,一度”,因此选项B为正确答案。
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