Though the old lady used her dog for a walk after supper ,now she has become used at hom

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(答案→)A. to take ,to staying
B. taking, to stay
C. to take, for staying
D. for taking, to stay
解析：考察used to用法。这个词后面接名词或动名词表示习惯了某事。接动词原形表示过去常常做某事。根据题意，尽管这个老妇人过去常常在晚饭后呆着她的狗去散步，现在她还是习惯了呆在家里面。故选A。