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
网友回答
A. honor
B. honoring
(答案→)C. to honor
D. having honored
解析：
这题考查不定式做目的状语：句意是：在星期六晚上北京近四百家超市准备使灯暗淡来纪念“地球一小时2010”。选C。