I just couldn't understand the former mayor the money raised for children in poor areas.

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(答案→)A. taking
B. to take
C. being taken
D. to be taken
解析：A 考察非谓语动词。句义：前任市长贪污了给贫穷地区孩子募捐的钱，对于此事我难以理解。现在分词表示主动和正在进行，过去分词表示被动和已经完成。不定式表示尚未发生。因为the former mayor和take之间构成主动关系，且动作已经发生，因此此处应该使用take的现在分词形式。故A正确。