liu fang was seen____an old man go across the road this morning(h_其他解答

liu fang was seen____an old man go across the road this morning(help)

人气：252 ℃　时间：2020-02-06 06:28:07

解答

to help
这里是被动语态,see 用于主动句应该是see sb do sth,省略to 的不定式变为被动语态时要加上to为什么是被动