In organic farming, natural waste from animals are made use of ________ the fields.A.fertilizingB.to fertilizeC.in fertilizingD.to fertilized
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B解析考查短语：make use of sth to do 利用什么做某事，被动形式为sth be made use of to do ,某物被用来做某事，句意：在有机耕种中，动物的天然粪便被用来给田地施肥。所以选B。