急需英语高手分析下下面句子结构特别是那几个whichIt’s a theory to which many economists subscribe,but in practice it often leaves railroads in the position of determining which companies will flourish and which will fail.

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急需英语高手分析下下面句子结构特别是那几个which
It’s a theory to which many economists subscribe,but in practice it often leaves railroads in the position of determining which companies will flourish and which will fail.