问题补充：
Devoted parents are never mean to their children, and they are always willing to devote all they have their kids.
A. to help
B. to helping
C. for helping
D. for help
答案：
A. to help
(答案→)B. to helping
C. for helping
D. for help
解析：句意：挚爱的父母从不会对孩子吝啬，他们总是愿意倾其所有帮助孩子。这里使用词组：devote sth to doing致力于做…，这里的to是介词，后面接动名词，所以选B.
