The poor little boy by his heartless parents was seen begging in the street.A. abandonin

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A. abandoning
B. to be abandoned
C. having abandoned
(答案→)D. abandoned
解析：考查非谓语动词。句中过去分词abandoned作定语，修饰名词the poor little boy，表示被动关系。句意：看见被他的无情父母抛弃的可怜的小男孩在大街上乞讨。故D正确。