They say it would cost too much for the American economy to move away from using oil and other fossil fuels.
这句的for the American economy应该不是动词不定式逻辑主语吧,我感觉像是状语修饰谓语,意思是“对于……来说”。
It是形式主语,for the American economy to move away from using oil and other fossil fuels是不定式复合结构作真正主语。也就是说for the American economy是不定式的逻辑主语。
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