The old couple often take a walk after supper in the park with their pet dog them.A. to fo

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A. to follow
(答案→)B. following
C. followed
D. follows
解析：考查with复合结构：with+宾语+宾语补足语，因为their pet dog和follow them之间是主动和进行关系，用现在分词做宾语补足语，句意：老夫妇经常在晚饭后散步他们的宠物狗跟着他们。选B。