There are only factories in this city before.A.one-fifth as many ...asB.one-fifth fewer...than

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There are only factories in this city before.
A.one-fifth as many ...as
B.one-fifth fewer...than

用b应该是The factories in this city are one-fifth fewer than before.
fewer than应该连在一起,不用分开

fewer 后面接不可数名词

这个城市的工厂只有过去的五分之一。