问题补充：
The old lady devoted her lifetime the homeless children.
A. to help
B. to helping
C. helping
D. for help
答案：
A. to help
(答案→)B. to helping
C. helping
D. for help
解析：考查非谓语动词。短语devote to将……奉献给，to是介词，后接名词或者动名词。句意：这位老人将他的一生奉献给无家可归的孩子们。故选B。
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