It depends on the definition of "civilization." According to one loose definition, Jewish civilization might be a good answer, as would, for example, that of the South Pacific region, or Sub-Saharan Africa.
Otherwise, Chinese civilization would also probably be an uncontroversial answer. South Asian civilization, too, insofar as some major cultural and religious and philosophical traditions have remained alive continuously in that region from ancient to modern times. European/ "western" would probably also apply.
Native American civilizations (Aztec, Incas, etc) and Arab/ Islamic civilization would not be good answers, since they originated after the ancient period ended.