Many dog owners treat their pets like human beings, if they do not have children of their

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A. absolutely
(答案→)B. especially
C. eventually
D. extremely
解析：B　考查副词。句意：许多宠物狗的主人对待它们就像对人一样，尤其是那些没有子女的人。故选especially“特别是；尤其是”。absolutely“绝对地，完全地”；eventually“最终”；extremely“极其地”。