In Disneyland every year, some 800,000 plants are replaced because Disney refused to _______ signs asking his “guests” not to step on them. A) put down B) put out C) put up D) put off选什么？为什么？
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C) put up 树立 put up signs 树立牌子put up signs asking his “guests” not to step on them树立警告游客不要践踏植物的牌子