题目内容

The kind lady devoted all her life ______ those homeless children.
A．helpedB．helping C．to helpD．to helping
D

试题分析：句意;这个好心的妇女把她的一生都奉献给了帮助那些无家可归的孩子。根据句意“奉献”是“devote sth. to doing sth.”,此结构中的to是介词，故选D。
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