I know she won't come to join us unless she ___to.A.tells B.has t_英语解答

I know she won't come to join us unless she ___to.
A.tells B.has told C.is told D.told
,为什么?

人气：494 ℃　时间：2020-01-09 06:01:59

解答

除非她被（is）要求（told）来参加（to come）,这是她被要求干什么,to后面省略了前面的谓语动词come.