---how long ___ each other before they ___ married --- For about _英语解答

---how long ___ each other before they ___ married
--- For about a year.
a.have they known ; get b.had they known ; got
为什么要用b不用a 怎么理解的?

人气：137 ℃　时间：2020-02-03 03:26:09

解答

都是过去发生的动作,但“认识”是在“结婚”之前,要用过去完成时态.