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_____ of their bad habits, the boys switched from being dependent on their parents to _____ for others.

A.Having rid; sacrificingB.To rid; sacrifice
C.Rid; sacrificingD.Having been rid; sacrifice

C

解析试题分析:句意:摆脱坏习惯后,男孩们从依赖父母的人变成了可以为他人牺牲的人。第一空需要非谓语动词做状语,the boys和rid是被动关系,要用过去分词rid, switch from…to... (从……转向……)中to是介词,后跟doing。所以选C。
考点:考查非谓语动词

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