A version of this story first appeared in CNN Business’ Before the Bell newsletter. Not a subscriber? You can sign up right here.Now, thanks to action from China, the frenzy may be on hold.What’s happening: Five top Chinese regulators announced Monday that they had jointly summoned key companies in the iron ore, steel, copper and aluminum sectors over the weekend. During the meeting, the agencies vowed to step up regulation and closely monitor commodities markets, warning that there would be

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