With corn, soybean, and wheat reserves being low enough so a poor harvest would send prices skyrocketing, grain futures brokers and their clients are especially interested in weather that could affect crops.
being low enough so
so low such that
so low that
that are low enough so
that are so low such that
c选项里是不是把being省略了,如果是的话,为什么可以省略?
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