【題目】________ of their bad habits, the boys changed from being dependent on their parents to ________ for others.
A.Having rid; sacrificing
B.To rid; sacrifice
C.Rid; sacrificing
D.Having been rid; sacrifice

【答案】A
【解析】考查非謂語動詞。句意：通過擺脫壞習慣后，男孩們從依賴父母的人變成了可以為他人犧牲的人。the boys是rid的執(zhí)行者，要用現(xiàn)在分詞的主動形式，排除C和D。changed from...to... （從……轉(zhuǎn)向……）中to是介詞，后跟doing。故選A。

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