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_________ in the United States,St.Louis has now become the 2

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_________ in the United States,St.Louis has now become the 24th largest city.
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
应该选哪个呢?有什么不同吗?请分析一下句子成分(即所填空中的句子应作什么成分).
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_________ in the United States,St.Louis has now become the 2
B
后面的半句句子成分完整,可以独立成句,所以前面应该表示伴随状态的.
A和D有主语,一个句子最忌讳双主语.
BC都可以,但从句意来说,是说这个城市以前不是第24大,所以排除C