问题：
试题 题型：未知 难度等级：
Nearly four hundred supermarkets in Beijing are preparing to
Nearly four hundred supermarkets in Beijing are preparing to dim(使暗淡) their lights ________ the "Earth Hour 2010" on Saturday night．
A．honor
B．honoring
C．to honor
D．having honored
试题 题型：未知 难度等级：
Nearly four hundred supermarkets in Beijing are preparing to
Nearly four hundred supermarkets in Beijing are preparing to dim(使暗淡) their lights ________ the "Earth Hour 2010" on Saturday night．
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参考答案：