_______in the united states,st.lousis has now become the 24t

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_______in the united states,st.lousis has now become the 24th largest city.
a.once the fourth biggest city b.being the fourth biggest city
为什么选a 具体点

once直接接作表语的名词,省略be动词,表示“过去曾经是”的意思.
如：Once a naughty boy,he's now a successful manager.这个曾经的淘气孩子现在是个成功的经理人.
不能用being,因为现在分词短语作状语表示与主句同时,意思不对.
全句的意思：圣路易斯曾经是美国第四大城市,但现在已经降到第24位了.

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