In the group discussion, they thought up three different __________to solving the environmental problemA.approachesB.meansC.waysD.methods
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A解析考查近义词辨析：这几个单词都有方法的意思：A. approaches后面接to doingB. Means后面是of doing C. ways 后面可接to do或of doing，D. methods后面接of doing，句意：在小组讨论中，他们想起三种不同的方法解决环境问题。选A。