【题目】How much money has he devoted these poor children return to school?
A. to help B. helping C. helps D. to helping
【答案】D
【解析】
试题分析：句意：他贡献了多少钱来帮助这些贫困儿童返校？根据句意及题干分析“贡献……去做”是devote...to doing sth.，故选D。
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