(单选题)

of their bad habits, the children changed from being dependent on their parents to for others.

A.Having rid; sacrificing

B.Rid; sacrificing

C.Having been rid; sacrifice

D.To rid; sacrifice

参考答案：A

参考解析：

考查现在分词作状语及动名词作宾语。句意：丢掉坏习惯后，孩子们从依赖父母转变成了为他人奉献付出。从后句谓语动词为过去时可知前面非谓语动词需用完成时，the children与rid of之间为主动关系，用现在分词形式，且rid of无被动语态，后空from being dependent与to后面的动词应该保持一致，介词后的动词应用-ing的形式。故选A。

知识点：

______ of their bad habits, the children changed from being dependent on their parents to ______for others.

of their bad habits, the children changed from being dependent on their parents to for others.