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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
 A.
本题考查非谓语动词。句意:通过摆脱坏习惯后,男孩们从依赖父母的人变成了可以为他人牺牲的人。the boys是rid的执行者,要用现在分词的主动形式,排除C和D。switch from…to... (从……转向……)中to是介词,后跟doing。
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