标题: Prep 255 题中pushing的用法 [打印本页] 作者: clairexuan9 时间: 2012-4-3 02:30 标题: Prep 255 题中pushing的用法 Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of a dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago, pushing back by more than 150,000 years the earliest date when it is known that humans made stone tools.
请教各位，这个句子当中的 pushing到底是做 have dated的伴随状语，还是 million years ago的同位语从句？