_____ 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.
本題考查非謂語動(dòng)詞。句意：通過擺脫壞習(xí)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(dòng)形式，排除C和D。switch from…to... （從……轉(zhuǎn)向……）中to是介詞，后跟doing。
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